Alternatives to KumoMTA

Experience secure and private email, calendars, and additional features, all at no cost and utilizing Free & Open Source Software (FOSS). We prioritize open standards and formats for every aspect of storage and communication, ensuring no vendor lock-in occurs. Your data is kept secure under Swiss jurisdiction, and will never be shared with third parties without your explicit permission. Our services comply with GDPR, HIPAA, and PCI regulations, and are built with security as a top priority from the very beginning. We offer perfect forward secrecy (PFS) and provide end-to-end encryption options, with no back doors present. Our comprehensive documentation addresses many commonly asked questions and more. If you're in search of an immediate answer or a swift solution, our Knowledgebase is an excellent resource. For any inquiries or issues that remain unresolved in the documentation, you can always reach out to our support team for assistance. We are committed to ensuring your experience is both safe and satisfactory.

Experience secure, enterprise-level email, calendar, and collaboration tools without breaking the bank. Kerio Connect offers a comprehensive suite of features and capabilities for messaging and collaboration without the intricacies and hefty costs associated with other platforms. It seamlessly integrates email with shared calendars, scheduling, contact management, tasks, notes, shared and public folders, and instant messaging. You can synchronize your messages directly to your preferred mobile devices using Microsoft ActiveSync. The Instant Messaging feature is compatible with XMPP, allowing use with various third-party chat and IM applications on both desktop and mobile devices. Installation of Kerio Connect takes just 10 minutes, with users able to start working within an additional 10 minutes. This solution can be deployed either on-premises or through partner-hosted cloud environments, accommodating users on Mac, Windows, or Linux systems. Furthermore, it provides comprehensive support for Outlook on both Windows and Mac, as well as numerous other IMAP or POP-compliant email clients, ensuring versatility and ease of integration for all users.

Alinto emerged in 2000, born from Philippe Gilbert’s visionary ideas, and his gamble certainly yielded fruitful results! By assembling a dedicated group of developers and cloud messaging specialists, he revolutionized the industry with the launch of Europe’s first messaging platform, which featured a cloud-based email service, along with the inaugural web-based email service that could be accessed via mobile phones. This innovation propelled us to become a significant player in the European digital landscape. As a provider of software mail servers, our teams in Research and Development, Marketing, and Support prioritize a strategy that emphasizes accessibility and personal connection. This initiative transcends mere electronic communication, as we deliver tailored support and solutions that align with your actual requirements and expectations. Additionally, our team of experts is readily available to assist you whenever needed. No matter if you are a telecom operator, an internet service provider, or an IT professional, our commitment is to support you effectively. With this level of dedication, we aim to foster lasting partnerships with all our clients.

PowerMTA is a robust email message transfer agent (MTA) designed for enterprises needing to send large volumes of critical emails. It can be deployed on your own servers or hosted on various public cloud platforms like Amazon Web Services and Microsoft Azure. With its exceptional reliability and advanced analytics, PowerMTA empowers users with complete oversight of their email campaigns. The software enhances performance, improves deliverability, and boosts team productivity thanks to its easy setup, minimal hardware requirements, and comprehensive analytics tools. Experience PowerMTA in conjunction with Signals, starting at $8,000 annually, to leverage volume pricing. This offering includes SparkPost Signals, which provides an in-depth analysis of your email performance across domains, campaigns, and individual recipients, enabling you to fine-tune your email strategies and proactively address potential issues. PowerMTA ensures unparalleled delivery rates and operates efficiently within a secure SMTP framework, allowing for rapid sending while maintaining full control over your email operations. With this powerful tool, organizations can transform their email marketing efforts and achieve remarkable results.

The optimal approach to constructing your mail server using open source software is to utilize platforms such as CentOS Stream, Rocky, Alma, Debian, Ubuntu, FreeBSD, and OpenBSD. By employing iRedMail, you can set up a FREE, OPEN SOURCE, and COMPLETELY FUNCTIONAL mail server in just a few minutes. We have taken care of the complexities by assembling all necessary open source components and implementing best practices, allowing our product to handle all essential tasks on your behalf. In addition, we provide professional support to assist you should you encounter any issues. You maintain complete ownership of your personal data stored on your hard drive, giving you the ability to control email security and review transaction logs. No external organization has access to the content of your communications. All components integrated into iRedMail are based on open source software, ensuring you receive bug fixes and updates from reputable Linux/BSD vendors. With iRedMail, you are not only building a mail server but also gaining peace of mind knowing that your email system is secure and private. In this way, iRedMail stands out as the definitive solution for those looking to establish a mail server using open source software.

Enhance your productivity with a business-class email and calendaring solution. With Exchange, you can effectively collaborate on essential documents while enjoying a streamlined inbox that highlights significant messages and adjusts to your individual work habits, allowing you to accomplish tasks more efficiently. Benefit from a customized inbox filled with useful features, along with a more structured method for managing and engaging with your emails. Enhanced search functions deliver quicker and more comprehensive results, and the inclusion of Add-ins provides powerful customization options that link you to contemporary services and internal business applications. Additionally, optimize your schedule with a sophisticated calendaring system that surpasses mere appointment setting, automatically capturing details from emails like flight confirmations and hotel bookings, and offering venue suggestions based on your current location. Microsoft Exchange Online serves as a robust hosted email platform designed for businesses, ensuring the protection of your data through advanced security measures. With these tools combined, you can streamline your workflow and empower your team to work more innovatively.

XgenPlus is the most advanced enterprise email solution. Communicate and collaborate with it. It is the first IDN Email Server to provide EAI (Email Address Interization), i.e Linguistic Email Address, like (Email address written in Hindi). It is an email management software that can be used by any enterprise, SME, PSU, or government. department. It supports all the basic features like POP, IMAP and webmail, calendars, contacts, SMS, scheduling and security. Key Features IDN Email - The only internationalized domain name email hosting server Policy for auto archival and mail retention Merge / de-merge email account Group Mail with a Tracking Report Broadcast email Schedule Email / SMS & Other... Benefits: Reliable - 99.99% uptime Scalable: Flexible to meet the needs of your organization Robust Security: Inbuilt Antispam software Live Chat, On-Call, and Offline Support Available 24x7 Easy Data & Administrative Control Better Storage

Inbotiqa's YUDOmail Intelligent Business Email Solution provides automation and case management for Enterprise clients. This allows them to reduce costs, reduce risk and achieve revenue growth. Analytics also gives them unprecedented management insight. Enterprise-grade email and workflow system is focused on shared mailboxes with business-critical information. 100% execution is achieved, with reduced turnaround times and no email being missed. Teams can concentrate on tasks of value rather than managing email, which dramatically improves customer service and productivity. Accountability is assured, while tracking and traceability create a clear audit trail for organisational memories and compliance as well as audit purposes. Intelligent Business Email by Inbotiqa transforms the primary business communication channel in the world.

Haraka is capable of managing thousands of simultaneous connections and can process an impressive volume of messages each second. Both Haraka and its plugins are developed using asynchronous JavaScript, resulting in exceptional speed and performance. With robust spam protection mechanisms available through its plugins, Haraka serves effectively as a filtering MTA. Additionally, it functions well as a Mail Submission Agent (MSA) on port 587 when utilizing authentication and DKIM signing plugins. Unlike traditional mail servers such as Exchange or Postfix, Haraka is not designed to act as a mail storage solution, Local Delivery Agent (LDA), or an IMAP server like Dovecot or Courier. Instead, it is typically combined with these systems for enhanced functionality. The built-in outbound mail delivery engine of Haraka is scalable, ensuring efficient processing of messages marked for relaying through authentication plugins, which are automatically queued for delivery. Furthermore, Haraka's plugin framework allows for easy extensions, making it a complementary option for traditional MTAs that may lack adequate filtering capabilities, thus enhancing the overall email handling process. This modular approach provides flexibility, enabling users to tailor their email solutions according to specific needs.

Oracle Communications Messaging Server is an Internet messaging solution built on standards, aimed at providing robust and high-capacity message handling for both service providers and their end-users. This versatile Messaging Server accommodates various email protocols and is capable of managing a wide array of content types, including embedded text, audio, graphics, video files, and other formats. Its design ensures reliability and efficiency in message delivery, making it a preferred choice for organizations seeking effective communication tools.

MDaemon Email Server supports IMAP and SMTP protocols. It delivers solid performance thanks to its feature-rich, user-friendly design. The email server software is low in total cost of ownership (TCO), and is specifically designed to meet the needs small- to medium-sized businesses. MDaemon supports multiple languages, content filtering, and multiple domains. It also offers flexible administration and an open standard design.

The relay restrictions have been entirely reimagined to feature a more user-friendly interface that allows for enhanced control over relay security measures. Additionally, EIMS introduces its own Domain Name Resolver (DNR), designed to address issues present in the Open Transport DNR and to improve performance compared to the OS X DNR, although it currently lacks support for non-recursive DNS configurations. Furthermore, a new SMTP Submit port has been added, operating on TCP port 587 by default, mirroring the functionality of the standard SMTP port; this is particularly beneficial for clients whose ISPs restrict access to port 25. An option to set a maximum number of recipients per message has been incorporated, and the previously mandatory Expand SMTP Addresses feature can now be disabled, a change from EIMS versions 3.1 and earlier where it was always enabled. In addition, the SMTP server on both ports 25 and 587 is now equipped to log Telnet connections and recognize activities resembling port scans, enhancing security monitoring capabilities. Overall, these updates aim to provide users with greater flexibility and security when managing their email services.

Mailcow: Dockerized is a self-hosted email and groupware solution built on Docker technology. It incorporates a variety of established and reliable components that work together to create a hassle-free email server experience. Each application is encapsulated within its own container, all linked through a bridged network for seamless interaction and functionality. This modular approach enhances the scalability and maintainability of the server setup.

Provide your clients with robust, enterprise-grade email hosting coupled with a range of enhanced services. This is an outstanding option for service providers, capable of accommodating anywhere from thousands to millions of users. Attract new clientele by presenting a premium email server solution that offers significant adaptability, seamlessly integrating it into your current system. You can oversee your email communications, coordinate and share calendars, and sync mobile devices, all supported by a secure and efficient mail server. This solution is ideal for companies of any scale. Axigen boasts extensive expertise; explore its various features and select the ones that suit your needs best. Simplify your email management and enhance productivity with integrated calendars, task lists, and notes. Experience desktop-like functionality in your web browser through intuitive keyboard shortcuts, drag-and-drop features, a dynamic email list view, frequently accessed folders, customizable email filters, automated out-of-office responses, and personalized blacklist/whitelist options for a tailored email experience. This comprehensive email hosting service ensures that users can operate efficiently and effectively, no matter where they are.

hMailServer is a complimentary and open-source email server designed for the Microsoft Windows platform. It is utilized globally by various entities, including internet service providers, businesses, governmental organizations, educational institutions, and individual users with a passion for technology. The server accommodates standard email protocols such as IMAP, SMTP, and POP3, making it compatible with numerous existing webmail systems. Additionally, it features a customizable score-based spam protection system and can be integrated with virus scanners to ensure that all incoming and outgoing emails are thoroughly checked for threats. This versatility makes hMailServer a popular choice for those seeking a reliable email solution.

Enhance your Outlook experience through features like push email, personal information management, group scheduling, availability services, public folders, delegation, and additional functionalities. By utilizing fewer servers and attractive subscription models, you can boost your profit margins effectively. Furthermore, cut down on licensing expenses while capitalizing on your team's current expertise by adopting a Linux-based system. Scalix offers starter packs that serve as comprehensive, single-server messaging solutions tailored for smaller enterprises and organizations, delivering a complete suite of email and collaboration tools. The Scalix small business edition is specifically crafted for small enterprises, providing a rich array of business capabilities, including the ability to quickly recover deleted user-specific items, support for mobile devices, and various other essential features. This solution not only facilitates efficient communication but also empowers businesses to operate seamlessly in a competitive landscape.

The system analyzes all web traffic and can block specific websites through both HTTP and HTTPS using the Squid proxy. It is integrated with ClamAV antivirus and employs site blacklists for enhanced security. The setup features a multi-domain web server powered by a ready LAMP stack, allowing for the hosting of multiple domain names on a single server. Built on NextCloud, it offers universal access to your files via the web, personal computers, or mobile devices, ensuring you can access your information from anywhere. Additionally, it provides a private alternative to Slack through the Mattermost platform, which facilitates secure collaboration among teams. The modern web interface, built on Cockpit, streamlines common administrative tasks and boasts a quick and straightforward installation process. This infrastructure is based on CentOS/RHEL, a widely used server distribution known for its routine security updates and exceptional stability, making it a reliable choice for various applications. With this setup, users can benefit from both functional versatility and robust security measures.

WinGate Proxy Server serves as an efficient and versatile HTTP Proxy server, SOCKS server, and integrated Internet gateway, tailored to address the access control, security, and communication requirements of modern enterprises. With a diverse array of features, it offers flexible licensing options that can adapt to the budgets of different users, whether for a large corporation, a small business, or a residential network. This server enables the sharing of various types of Internet connections, permitting numerous users to browse the web, access email, and utilize other online applications as if they were directly online. Regardless of whether the connection is through a standard dial-up modem or a high-speed fiber line, WinGate Proxy Server enhances the overall usage of that connection. Furthermore, it is compatible with multiple Internet protocols, facilitating the functionality of applications including web browsers, messaging tools, FTP, and SSL. Overall, WinGate Proxy Server is an invaluable tool for any organization looking to streamline its internet access and improve security measures.

Setting up a fully operational mail server can be achieved in just a few minutes, primarily spent waiting for the necessary scripts to execute. The entire system is engineered with sensible defaults, allowing you to get started swiftly without needing in-depth knowledge of the internal workings or risking system integrity with potentially harmful choices. User information and configurations are meticulously separated from the executable files, with the user database maintained in an SQLite format, which is file-based. This structure ensures that Poste.io seamlessly integrates with external storage options, making tasks like migration, backups, and updates straightforward and predominantly involving file handling. Designed with a focus on security from its inception, Poste.io addresses the serious security challenges that have historically plagued the internet. Rather than compromising on compatibility with outdated email clients and vulnerable authentication processes, it prioritizes features that align with contemporary security standards, ensuring users can trust their communications. Additionally, this commitment to security reflects an awareness of the evolving landscape of cyber threats, making Poste.io a robust choice for reliable email management.

Our comprehensive Unified Communications technology is anchored by the CommuniGate Pro platform. This system facilitates extensive Unified Communications through open APIs that allow seamless integration with various business applications. With the ability to scale to hundreds of millions of accounts, CommuniGate Pro is perfectly suited for large-scale alert systems, multimodal communications in web applications, or highly secure network architectures. Importantly, achieving such scale does not compromise efficiency or reliability; the platform is exceptionally agile and capable of supporting resilient applications in military and embedded environments. Furthermore, CommuniGate Pro has received approval for use by governmental agencies in both Europe and the USA. Its reputation for outstanding stability—boasting impressive uptimes akin to VMS—has made it a trusted choice among military, transportation, and research institutions. Additionally, the platform enables banks to efficiently manage email services for millions of clients while ensuring compliance with regulatory standards. The server's signaling capabilities can also be effectively implemented within a hybrid system, enhancing its versatility even further. This makes CommuniGate Pro a top-tier solution for organizations looking to optimize their communications infrastructure.

Cyrus IMAP serves as a server for emails, contacts, and calendars, and is available as free and open-source software. Among its many features are high-speed performance, strong security measures, and efficient resource management. Additionally, it includes powerful search capabilities and supports both CardDAV and CalDAV protocols. The platform ensures robust data storage and offers replication features, making it suitable for large-scale installations. Flexible filtering through Sieve allows for customizable email handling, while integration with antivirus and antispam toolkits enhances its security. Moreover, Cyrus IMAP effectively manages deliverability standards such as SPF, DKIM, and DMARC. It provides extensive authentication possibilities through Cyrus SASL and includes support for JMAP, alongside a comprehensive array of supported standards that enhance its versatility. Overall, Cyrus IMAP is an ideal solution for organizations seeking a reliable and feature-rich email server.

Citadel offers email, collaboration, groupware, and content management solutions that can be quickly deployed on your own servers or in the cloud. With its unique room-based architecture, Citadel is not only user-friendly but also highly adaptable and robust. Unlike any other platform, it successfully integrates a wide range of features while maintaining a familiar and cohesive interface. This software is entirely open source, distributed under the GNU General Public License, ensuring users access the full version without limitations or cost. You can download the most advanced version available here, and the best part is that it’s all provided at no charge. This makes Citadel an exceptional choice for those seeking powerful and comprehensive software solutions without the financial burden often associated with enterprise editions.

SmarterMail is the ideal Microsoft Exchange alternative. First, it's the only business email server on the market that offers native support for the protocols that power Exchange: MAPI, EWS, and EAS. It does this without the need for any additional software or plug-ins for Microsoft Outlook or other clients -- desktop and mobile! Best of all, it offers all of the features of Exchange, but at a FRACTION of the cost. In addition, features like audio and video group chat, and Online Meetings for team meetings and group collaboration are included at no extra charge. It's designed to provide the functionality businesses need, without sacrificing secure, reliable access to business, and personal, communication.

Exim serves as a mail transfer agent (MTA) for Unix-like operating systems. Initially developed by Philip Hazel in 1995 for the University of Cambridge Computing Service's email systems, Exim is released under the GPL, allowing users to freely download, utilize, and modify it. While it shares some similarities with Smail 3, Exim has evolved to offer greater user-friendliness and flexibility. Both Exim and Smail 3 operate on the Sendmail design model, where a single main binary manages all MTA functionalities. Although this monolithic architecture is sometimes viewed as less secure and slower, Exim boasts a superior security record compared to Sendmail and matches the performance of Qmail and Postfix, particularly in advanced functions like queue management, address routing, and testing. Notably, Exim lacks a built-in Graphical User Interface (GUI) for configuration, although some Linux distributions may provide one, enhancing its accessibility for users who prefer a visual approach. As a result, Exim remains a versatile choice for those looking to manage email systems effectively.

The Courier mail transfer agent (MTA) serves as a comprehensive mail and groupware server that utilizes widely recognized protocols, including ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Within a unified framework, Courier delivers a range of services, such as ESMTP, IMAP, POP3, webmail, and mailing list functionalities, allowing users to easily enable or disable specific components as needed. Recently, the Courier mail server has introduced fundamental web-based calendaring and scheduling features within its webmail module, with plans for more sophisticated groupware calendaring capabilities to come shortly. Notably, the source code for the Courier mail server is designed to compile on most POSIX-compliant operating systems that utilize Linux or BSD-derived kernels, and it can also be successfully compiled on Solaris and AIX systems, provided users utilize the appropriate freeware add-on tools from Sun or IBM. The development of the Courier mail server is rooted in a combination of several interrelated projects that converged into its current form, and it also incorporates SMTP extensions specifically aimed at enhancing mailing list management functionality. In this way, Courier not only serves as a versatile mail server but also as a collaborative tool for users seeking effective communication solutions.

Horde stands out as the most adaptable groupware solution available, making it an ideal foundation for developing your business productivity applications. It boasts compatibility with a wider array of backends—including all major SQL, LDAP, IMAP, Sieve, SMTP, and caching platforms—than any other open-source groupware option currently on the market. As a result, you can seamlessly integrate your existing user base without requiring them to remember additional passwords. The extensive feature set of Horde is on par with the most prominent enterprise email systems, offering remarkable capabilities that hold up against competitors in our core applications, such as mail, calendar, and address book, as well as excelling in secondary applications like time tracking, wikis, and ticketing systems. Furthermore, this versatility ensures that users can tailor their experience to meet their unique needs, enhancing overall productivity and satisfaction.

Enhance your team's productivity with a local email solution that prioritizes data control, security, and dependability. Create customized mailboxes utilizing advanced filters and labels to stay updated on relevant matters. Disable conversation view to separate email threads into individual messages, allowing you to manage your communications in a familiar way. Collaborate more effectively by inviting colleagues to share access to the same mailbox, facilitating joint project efforts. Support multiple email domains on a single server while independently configuring each one to meet specific needs. Establish various login methods, manage daily email usage limits, and set tailored policies for different users and groups. Delegate administrative responsibilities by role to streamline the management process. Gain insight into potential threats to your team's email communications through straightforward visual representations. Utilize the powerful Rspamd engine to identify spam and enhance your understanding of email security risks, ensuring your team remains protected against emerging threats. This comprehensive approach not only boosts efficiency but also fosters a collaborative work environment.

The Matrix Platform is engineered to enhance collaboration and efficiency among various teams and departments. For over three decades, we have supplied robust group email solutions tailored for shipbrokers, charterers, and commodity traders. It features secure email and fax processing capable of handling high volumes, while offering either a Simple or Classic User Interface to cater to diverse user preferences. Complete integration with S&P, Chartering, Offshore, and Fixtures modules is also available, allowing seamless workflow. This platform enables teams, departments, and groups to collaborate effectively, thereby boosting overall productivity. Incoming and outgoing messages are governed by specific 'Rules' that ensure appropriate visibility for the right workgroups and individuals. Users will receive proactive notifications for emails that match their selected keywords. The system empowers users to prioritize essential commercial communications that generate revenue. Additionally, any messages marked as read on mobile devices will automatically reflect as read on the Matrix client, ensuring consistent communication across all platforms. Overall, the Matrix Platform is a comprehensive solution that significantly streamlines communication processes.

grommunio provides a comprehensive solution for the needs of contemporary digital communication and collaboration. Its features encompass the seamless management of sensitive information, including emails, contacts, calendars, chat, video conferencing, and file sharing, all operating independently of any specific device or operating system, and functioning in real time. Leveraging open-source technology built on a Linux foundation, grommunio is highly scalable and adheres to strict security standards. Its sophisticated architecture ensures smooth integration with pre-existing systems, requiring minimal effort. Boost your productivity by consolidating the management of emails, contacts, calendars, tasks, and more into a single platform. With its enterprise-grade Active Sync feature, users can access their data across all devices instantly. Easily invite participants to online meetings through grommunio Meet directly from your calendar, share various file types using grommunio files, and maintain communication with your team simultaneously via grommunio chat, fostering a more connected and efficient work environment. This holistic approach streamlines workflows and enhances team collaboration.

GroupWise provides users with a dynamic, flexible interface that is intuitive and easily configurable to meet their organization's needs. GroupWise is powered by cutting-edge data center technology that provides modern email, calendaring and contact management functionality. The GroupWise task management software allows you to create, view, and manage tasks, appointments, reminders, and other tasks. GroupWise gives you easy and central access to your contacts and groups, organizations, and resources. Secure messaging gateway offers zero-hour anti-spam and antivirus protection on-premises and in the cloud. Even though bad things can happen, your email and collaboration data will still be protected. Enterprise-grade archiving protects against data loss. GroupWise offers robust messaging, calendaring and task management. It also provides contact management via a web-based, mobile administrative dashboard.

There is no office. That is the only rule. TeamChat for project teamwork, business email, TeamChat to collaborate on office documents, and online meetings. All this and more in our secure cloud at half the cost. Chat in groups organized around projects, upload files and mention coworkers. Comment on emails posted by others. Pin important posts. Integration with email allows you to share received messages directly into TeamChat room to catch the attention of colleagues. Desktop Client and Desktop Office documents for Windows and Linux will help you increase your office productivity. You can choose to purchase the entire Suite or just the apps you need.

Mailtraq Professional mail server software serves as a comprehensive solution for businesses seeking efficient email management. It delivers all necessary functionalities at an affordable cost, eliminating common complications associated with email servers. As a perfect alternative to Microsoft Exchange, Mailtraq is user-friendly to deploy and straightforward to oversee. With attractive licensing fees, no server client access licenses (CALs), and reliable performance, Mailtraq is the go-to choice for small to medium-sized businesses and home offices. Email plays a crucial role in the operations of any organization, and the security of stored messages is essential for the sustained success of your company. Although managing your own email server can involve some level of complexity and costs, it provides you with total physical control over who accesses your email communications. In contrast, utilizing your internet service provider's email service raises privacy concerns, as their administrators can access and read your messages. Likewise, relying on a software-as-a-service (SaaS) provider for hosted email solutions means you may not only be unaware of who is accessing your emails but also lack information about the physical location of your data storage. Therefore, opting for Mailtraq ensures both control and peace of mind regarding your email integrity and confidentiality.

qmail serves as a robust, secure, and efficient message transfer agent that prioritizes simplicity. Its emphasis on security is not merely an aspiration but a fundamental necessity, given the critical nature of mail delivery for users, which must remain uninterrupted and entirely secure. With a philosophy that ensures a message, once accepted, is never lost, qmail adopts a straight-paper-path approach to guarantee reliability. Additionally, it offers optional support for maildir, a highly reliable mailbox format that prevents corruption during system crashes—unlike traditional mbox files and mh folders. This feature allows users to read their emails safely over NFS, with the added advantage that multiple NFS clients can deliver emails concurrently. Notably, qmail's design is considerably more compact than other Internet MTAs, which often rely on separate mechanisms for forwarding, aliasing, and mailing lists; instead, qmail streamlines this with a singular forwarding system that empowers users to manage their own mailing lists efficiently. Ultimately, qmail stands out not just for its performance but also for its innovative approach to email management.

MailEnable offers a comprehensive solution for secure email and collaboration services, gaining recognition in a recent independent survey as the leading Windows Mail Server Platform globally. Whether you are a large hosting provider catering to numerous users or a small business managing a single domain, MailEnable delivers a solution that is sure to satisfy your email users. The Windows Mail Server software from MailEnable boasts features that rival those of Microsoft Exchange, including robust messaging protocols like Exchange ActiveSync, IMAP, SMTP, and POP3, along with collaborative tools such as calendaring (CalDAV), contacts (CardDAV), tasks, and notes. This extensive feature set ensures that users have access to everything they need for seamless communication and organization.

Take back your autonomy and safeguard your personal information by setting up your own email server, a process that can be completed in under 10 minutes! With Modoboa, you can establish your email server at no cost in less than 10 minutes. When it comes to establishing a mailbox, you typically have a few choices: - Rely on services provided by internet and infrastructure companies (like Orange, Vodafone, OVH, or Gandi), which often require a monthly or annual fee, but they come with limitations on customization, configuration options, and the number of domains and mailboxes you can use. - Opt for free email services (such as Gmail, Live, or Yahoo), which come with restrictions and often exploit your data for commercial gain. - Set up your own email server, although this usually demands a significant level of technical expertise for proper installation and configuration. Modoboa presents a viable alternative to these three options. It liberates you from the constraints of traditional email providers, allowing anyone to create a secure email server independently. Best of all, this entire process takes less than 10 minutes and is completely free of charge. Embrace the freedom of managing your own email with ease!

As a business on the rise, maintaining strong connections is essential, and that means you definitely need email services. However, managing daily operational hurdles can be overwhelming, and that's where we come in. You're in the perfect place for assistance. GMS has been a trusted name since the dawn of email, bringing a wealth of experience in catering to customer needs. We understand your challenges because we share your commitment to your business. Our approach is straightforward: we avoid complex jargon and strive for clarity. With GMS, you receive the perfect email solution tailored for small enterprises, along with comprehensive support. Transitioning to the Cloud means businesses and individuals can eliminate concerns about power needs, physical space, or software upgrades. With cloud computing, the burden of physical storage and ongoing maintenance is lifted, resulting in a markedly lower total cost of ownership. Ultimately, this shift empowers you to focus more on your business and less on IT concerns.

Dovecot Pro stands out as a comprehensive email solution that offers exceptional scalability, impressive performance, optimal hardware usage, and superior support for major telecommunications companies, internet service providers, and hosting services globally. Holding a dominant 76% share of the email backend market, Dovecot Pro is trusted by its customers for reliable performance and minimal downtime. Its efficient management of hardware resources, alongside innovative monitoring tools for statistics and administration, effectively lowers ownership costs while saving both time and maintenance expenses. Additionally, Dovecot Pro has the capacity to expand both vertically and horizontally, accommodating hundreds of servers, millions of users, and multiple physical locations. The architecture is stateless and native, allowing for maximum adaptability, as every significant component can be independently deployed on dedicated nodes. Moreover, Dovecot Pro excels in providing top-notch support for all essential email standards, ensuring seamless Mail Delivery Agent capability through LMTP and Sieve, while also facilitating mail retrieval for various clients via IMAP and POP3 protocols. This robust infrastructure underlines its commitment to meeting the diverse needs of its client base.

OpenSMTPD serves as a free implementation of the SMTP protocol for server-side email communication, as laid out in RFC 5321, and incorporates several additional standard extensions. This software enables standard machines to facilitate email exchanges with other systems that also utilize the SMTP protocol. Born from a desire for a more satisfactory alternative to existing solutions, OpenSMTPD offers a comprehensive SMTP implementation. The project is mainly driven by developers Gilles Chehade and Eric Faurot, alongside contributions from numerous OpenBSD developers and collaborators from various other communities. Its development reflects a commitment to improving email server functionality and reliability across different platforms.

Your computer, tablet, and smartphone come equipped with applications and operating systems, so why should your server be any different? HPE is revolutionizing the small business server market by providing ClearOS in conjunction with their ProLiant servers. ClearOS is an accessible, open-source operating system featuring a user-friendly graphical web interface and an application marketplace that boasts over 100 applications, with new ones continuously being added. By utilizing open-source technology, you have the autonomy to select only the applications you need while paying solely for the desired apps and their support. HPE and ClearCenter are simplifying the process for small businesses, home offices, remote workers, and branch locations to have a fully operational server right out of the box, without incurring extra costs. The combination of HPE ProLiant servers and ClearOS ensures users enjoy a straightforward, cost-effective, and secure solution. Crafting the perfect IT setup tailored to your needs has never been more straightforward or accessible. With this innovative approach, small businesses can now focus on growth rather than infrastructure.

Mailu is a versatile and straightforward mail server offered through a collection of Docker images, designed as free and open-source software that encourages user feedback and contributions. The objective of this project is to deliver an easy-to-install and maintain mail server that is comprehensive and avoids the inclusion of proprietary tools or unrelated features that are frequently part of mainstream groupware solutions. Key functionalities of Mailu encompass: A standard email server setup supporting IMAP and IMAP+, SMTP, and Submission with automated configuration profiles for various email clients. Sophisticated email capabilities, including aliases, domain aliases, and custom routing options. Web-based access featuring multiple webmail interfaces alongside an administrative dashboard. User-centric functionalities such as aliases, auto-reply, auto-forward, and the ability to fetch accounts from other servers. Administrative features that cater to global management, making announcements, domain-specific delegation, and setting quotas. Robust security measures that enforce TLS protocols, integrate DANE and MTA-STS, utilize Let's Encrypt for certificates, provide outgoing DKIM signatures, and incorporate an anti-virus scanner alongside Snuffleupagus for enhanced protection against malware and harmful attachments. Effective anti-spam tools that include auto-learning algorithms, greylisting techniques, DMARC and SPF support, and measures to prevent email spoofing. Overall, Mailu stands out as a comprehensive solution for users seeking a reliable and secure mail server environment.

Safeguard and send emails on a large scale with MailChannels, which helps identify malicious users and stops spammers from exploiting your systems. Keep track of outgoing emails to detect spam and any unusual sending patterns, thereby securing your customers' inboxes from spam, phishing, and other email-related dangers. The platform features a robust and user-friendly interface, streamlining the management of customer emails effectively. Our operations span across various cloud services, reducing the risk of single points of failure to maintain uninterrupted service availability. You can expect a response from a real person for your support tickets within 30 minutes, any time of day, year-round. MailChannels Outbound Filtering, a cloud-based SMTP relay service, actively spots and blocks spammers to guarantee dependable email delivery. By utilizing Outbound Filtering, you can resolve email delivery issues linked to IP address blocklisting. Additionally, the system automatically disables compromised accounts and scripts, bolstering your overall security posture while ensuring peace of mind. This layered approach not only enhances operational efficiency but also fortifies your email infrastructure against evolving threats.

Mail-in-a-Box allows you to establish your very own mail service provider with just a few straightforward steps, similar to creating a personalized version of Gmail that you have complete control over. Essentially, it transforms a new cloud computer into a fully functional mail server, and you don’t need to possess advanced technical skills to get it up and running. Each Mail-in-a-Box setup comes equipped with webmail access and an IMAP/SMTP server, making it compatible with both mobile devices and desktop email applications. Additionally, it offers synchronization for contacts and calendars, ensuring that all your information stays up to date across devices. Moreover, the system includes essential mail features such as spam protection through filtering and greylisting, customizable mail filter rules, automatic configuration for email clients, and scheduled backups to services like Amazon S3. Another advantage is its automatic DNS configuration, which simplifies the process when you allow it to function as your nameserver, enabling it to establish crucial DNS records that enhance mail deliverability and security, including SPF, DKIM, DMARC, and MTA-STS. Furthermore, when DNSSEC is activated along with DANE TLSA, it significantly elevates the level of security for your email communications.

The easiest email marketing platform that you have ever used. It's simple and intuitive to use, and it doesn't require you to "hunt" for what you can do. Simple, straightforward email automations. You can immediately move on to the next step without having to look at documentation, watch videos, or train your staff. You can send a broadcast to multiple contact lists simultaneously, as well as dynamic segments and groups of tagged people. Personalize any contact property from your database, including engagement, interests, behavior, etc. Contacts who engage with your broadcasts can be triggered into automated email sequences. With our intuitive drag and drop editor, you can create beautiful responsive emails. WYSIWYG is for minimalistic design or raw HTML for pixel perfection. Realtime engagement Tagging to track opens, clicks and messages received. To fine tune your audience, you can suppress segments, Tags, or upload suppression lists.

Reduce email volume by up 95% and have one source of truth for all communications, data, and documentation via shared team inboxes. SEDNA provides team members with full transparency of all correspondence, attachments and actions within a project or message thread. It also allows for quick composition and sharing, which makes communication easier and facilitates collaboration. Each email in a team's inbox has an activity panel that allows for internal conversations, contextual data, time-stamped activity, and other information. This allows team members to work with one message instead of multiple messages that bloat their inboxes. The Activity Panel allows you to see information about the message, including job references, category tags and people involved. It also shows who viewed the message and who responded. Collaboration is easy thanks to the ability of tagging others and adding comments for real-time discussions.

A web-based multilingual IMAP client featuring a user interface that mimics that of a traditional application. This client encompasses all essential email functionalities, such as MIME support, an address book, folder management, message searching, and spell checking. It also allows for efficient message handling through drag-and-drop features. Users benefit from a comprehensive address book that includes group options and LDAP connectors, as well as pre-defined response templates. Its responsive design ensures compatibility across multiple devices. Roundcube is utilized by thousands of services that offer webmail solutions to millions of users, and we take pride in seeing our application widely adopted. We firmly believe that having Open Source software for vital communication tasks is crucial for society as a whole. Below is a compilation of services that not only implement but also contribute to the development of Roundcube, highlighting how their usage supports the continuous enhancement of our webmail software, making it available at no cost to everyone. These collaborative efforts are fundamental to our mission of keeping the software updated and accessible to all.

JungleMail is designed to improve communication within your organization. You can effortlessly create engaging and fully responsive templates in just a few minutes by dragging and dropping various components such as content blocks, titles, and sections directly into the body of your newsletter. Additionally, you can seamlessly import updates from your SharePoint sites into your emails. By utilizing comprehensive analytics, you can evaluate critical metrics such as click patterns, top links, and device usage to refine the ideal tone and timing for your communications. Mail merge capabilities allow you to draw data from your SharePoint lists and groups to automatically customize and enhance your messages based on the profiles and conditions of recipients. There’s no need for coding expertise, as JungleMail functions entirely within your local network and domain, eliminating the necessity for external web service calls or data storage. The security of JungleMail is built upon the SharePoint model of list, folder, and item security, allowing for precise adjustments to user access for different features, ensuring a tailored experience for your team. Thus, JungleMail provides a robust solution for internal communication while maintaining high standards of security and user customization.

Easily manage your email scheduling with Boomerang for Gmail, which allows you to determine exactly when your emails are sent and received. With this handy tool, you can draft an email and set it to be dispatched at the ideal moment without any hassle. Simply compose your message as you usually do, then select the Send Later option to schedule it. You can utilize our intuitive calendar picker or input phrases like "next Monday" in the text box to specify when you'd like your email to go out. Once scheduled, you can relax knowing that Boomerang will handle the rest. If you're looking to maintain a tidy inbox while ensuring you don't overlook important messages, Boomerang can temporarily remove emails from your view until you're ready to address them. Just hit the Boomerang button while reading an email and specify when you'd like it returned. The service will archive your message and automatically restore it to your inbox at your chosen time, complete with options to mark it as unread, star it, or prioritize its position in your message list. This makes email management more efficient and organized than ever before.

Sendio's Opt-Inbox is an innovative sender management mechanism that filters messages that have passed through email security, preventing unwanted communications from cluttering a user's inbox and allowing only messages from preferred contacts or subscriptions. This system addresses the common problem of inboxes being overwhelmed by a barrage of cleared messages, which often include relentless sales pitches, marketing content, and bulk emails. As a result, distinguishing between harmful emails and those that might be relevant or useful has become increasingly challenging. This scenario can pose significant challenges for busy executives and professionals who cannot afford to miss critical communications, risking the chance of overlooking an important email among the chaos of their quarantine queue. Ultimately, the Opt-Inbox ensures that users maintain control over their email experience, allowing them to focus on what truly matters without unnecessary distractions.

Accomplish your tasks efficiently with a dedicated platform for your work applications. ‘nuffsaid empowers you to reclaim valuable time, potentially saving you up to 2 hours daily. The average knowledge worker is currently bogged down by 4.1 hours a day spent on emails alone, and if you utilize Slack, you might receive around 70 messages each day, not to mention the other platforms in use. By integrating your email, messaging, Salesforce, LinkedIn, SMS, and more into a personalized dashboard, ‘nuffsaid streamlines your workflow. The AI assistant intelligently organizes your emails, chats, meetings, and tasks, freeing you from monotonous tasks like data entry. Rather than toggling between your task list, email, and calendar, ‘nuffsaid allows you to effortlessly drag and drop messages and tasks into your calendar and back to your inbox. The era of maintaining a separate task list is over; you can seamlessly transform messages and meetings into actionable tasks, assign them accordingly, and receive automatic notifications for any overdue tasks. If you ever lose track of a conversation, you can swiftly locate messages, attachments, tasks, and appointments across all your platforms with a unified search tool. This remarkable integration not only enhances productivity but also fosters a more organized approach to managing your workday.

Get more responses, book more meetings, ensure that nothing slips through the cracks, and get more meetings. Fast-growing companies that care about customer service. Smart messaging can help you win more meetings, replies, and deals. Increase customer satisfaction and team engagement. Know exactly who opened your email and what content they viewed. Automate your work, increase sales performance and align your reps. From a bird's-eye view, analyze performance trends and improve process. You can open more doors and increase productivity by 10x without leaving your inbox.