Alternatives to Zentyal

Mailu is an easy-to-use, yet powerful mail server that comes as a Docker image. It is open source software, which means it's free (as in free beer and free speech), and is open to external contributions. The project aims to provide people with an easily configured, easily maintained, and full-featured email server without shipping proprietary software or unrelated features that are often found in popular groupware. The main features include: Standard email server with IMAP, IMAP+, SMTP, and Submission profiles for clients Advanced email features: aliases and domain aliases. Custom routing Webmails, multiple access to webmails, and administration interface User features, aliases auto-reply and auto-forward. Fetched accounts Admin features, global admins, announcements, per-domain delegation, quotas Security, enforced, TLS, DANE MTA-STS Letsencrypt, outgoing DKIM Anti-virus scanner Snuffleupagus Block malicious attachments Antispam, auto-learn, greylisting, DMARC& SPF, anti-spoofing

You can manage Linux users and client hosts within your realm from one central location using CLI, Web UI, or RPC access. Allow Single Sign On authentication for all of your systems, services, and applications. Kerberos authentication policies and authorization policies should be defined for your identities. Control services like DNS, SUDO, SELinux or autofs. Integrated security information management system that combines Linux (Fedora), 389 Director Server, MIT Kerberos and NTP. Also includes DNS, Dogtag certificate system, SSSD, and other options. Built on top of standard protocols and well-known Open Source components. FreeIPA is an integrated security management solution that combines Linux (Fedora), 389 Director Server, MIT Kerberos and MIT Kerberos. It also includes NTP, DNS, Dogtag, Certificate System, and NTP. It includes a web interface as well as command-line administration tools.

Mail-in-a Box lets you create your own mail service in just a few simple steps. It's like creating your own gmail that you can control from the top down. Mail-in-a Box is a cloud computing service that turns a new computer into a functioning mail server. You don't have to be a tech expert to set this up. Mail-in-a Boxes include webmail, an IMAP/SMTP Server and desktop mail software. It also includes calendar and contacts synchronization. The box includes standard mail functionality such as spam protection (spam filters and greylisting), email client auto-configuration, mail filter rules, and automated backups via Amazon S3 or other services. When you choose to let it be your nameserver, the box will also automatically configure DNS records that are important for mail deliverability, security, and other factors, such as SPF, DKIM DMARC and MTA STS. DNSSEC (with DANE TLSA enabled) provides a higher degree of protection when enabled.

MailEnable is a complete solution that provides secure email and collaboration services. MailEnable is the most popular Windows Mail Server Platform according to a recent independent survey. MailEnable is a solution for small businesses and hosting companies that provide email services to thousands end users. MailEnable is a Windows Mail Server with features similar to Microsoft Exchange. It offers powerful messaging services such as Exchange ActiveSync, IMAP and SMTP and collaboration tools like calendaring, contacts, tasks, and notes.

Dovecot is a great choice for both small- and large-scale installations. Dovecot is one of the fastest IMAP servers, and it still supports the standard Maildir and mbox formats. Dovecot's high performance is due to the transparent indexing of mailboxes. Dovecot is compliant with standards. Dovecot is compliant with all IMAP server standards. Dovecot's Indexes are automatically optimized. They contain only what the client of the user needs most often, nothing more or less. Dovecot has self-healing capabilities. It fixes most of the problems that it finds on its own, like broken index files. The problems are logged, however, so that the administrator can try to determine what caused them later. Dovecot strives to be administrator-friendly. The common error messages are as clear as possible.

hMailServer for Microsoft Windows is a free and open-source e-mail client. It is used by Internet service provider, companies, government, schools, and enthusiasts around the world. It can be easily integrated with most existing webmail systems. It offers flexible spam protection based on scores and can be attached to your virus scanner for scanning all incoming and departed email.

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.

Dovecot Pro, a full-service platform for email, delivers dynamic scaling, high performance, efficient hardware utilization, and outstanding customer support to the largest Telcos and ISPs in the world. Dovecot Pro has a 76% market share of email backends installed. Customers trust its performance. The efficient hardware utilization and advanced monitoring for statistics and administration can reduce ownership costs, save time and maintenance. Dovecot Pro can scale up to hundreds of servers, millions of users, and multiple physical locations. Its native stateless architecture allows for maximum flexibility, as each major component is able to be deployed on a dedicated node. Dovecot Pro offers industry-leading support for email standards, including LMTP (Mail Delivery Agent) and Sieve (Mail Client Retrieval).

Relay restrictions have been completely rewritten with an easier-to-use interface that allows for finer control of relay security. EIMS has its own domain name resolver, which fixes bugs in the Open Transport DNR as well as performance issues with the OS X DNR. The new DNR currently does not support non-recursive domain names. SMTP Submit Port, this is a secondary SMTP port that runs on TCP port 587. It currently functions exactly the same way as the standard SMTP. This is useful for clients who are behind an ISP which blocks port 25 access. Sending Setup option to set maximum recipients per message. You can now turn off the Expand SMTP addresses option. This was always on in EIMS 3.1. The SMTP (both port 25 or 587) server now reports Telnet and connections that appear to be port scans (connections with no data sent and where it doesn't stop timer).

Courier's mail transfer agent (MTA), an integrated mail/groupware service, is based on commodity open protocols such as ESMTP and IMAP. It also supports SSL, LDAP and HTTP. Courier offers ESMTP, IMAP and POP3 services, webmail and mailing lists within a single, consistent framework. Individual components can easily be enabled or disabled. The Courier mail module now integrates basic web-based scheduling and calendaring services into the webmail module. Soon, advanced groupware calendaring will be available. The Courier mailserver's source code should be able to compile on all POSIX-based kernels, including Linux and BSD. The Courier mailserver should also compile under Solaris and AIX with the help of Sun's or IBM’s freeware addon tools for each operating system. The Courier mailserver evolved from several related projects that were merged together (more about that later). The Courier mailserver implements SMTP extension for mailing list management.

Mercury receives mail from the outside and places it in the mailbox of the recipient, so that the user can retrieve it at any time. Mercury receives messages sent by local users and delivers them to the outside world. This relieves the user of the burden on his workstation, allowing him to focus on other tasks. If you connect via dialup, only the mail server can access this connection. Your workstations don't need their own modems and Internet accounts. The mail server will continue to process mail even if the client workstations have been turned off. This allows functions that rely on a constantly available service such as auto-forwarding and automatic replies.

MailSite Fusion is a Windows email, calendar, and contact server that can push to all types smartphones. It also has full native Outlook sync and a sophisticated AJAX client. It can also share calendars and contacts with other clients. Readers of Windows IT Pro Magazine have voted MailSite as one of the top three mail server products for three consecutive years. Your organization's email services are vital. You need to ensure that you choose a high-quality product from a company that has a track record in communication software. Why this mail server? Rockliffe is sensitive to your concerns and has been developing and refining email security software and email servers for businesses and service providers since 1995. MailSite Fusion was built from the ground up to meet your most important requirements.

SOGo is a trusted and fully supported groupware server that focuses on scalability, open standards and trust. SOGo is available under the GNU GPL/LGPL version 2 and higher. SOGo is a rich AJAX-based Web application that supports multiple native clients by using standard protocols like CalDAV (CarDAV), CardDAV (GroupDAV) and Microsoft ActiveSync. SOGo is the missing piece of your infrastructure. It sits in the middle your servers to provide a consistent and complete interface for your users to access their information. It has been used in production environments with thousands of users.

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.

OpenSMTPD implements the server-side SMTP standard as defined in RFC 5321 with some additional extensions. It allows machines to send and receive emails from other systems that use the SMTP protocol. OpenSMTPD was born out of dissatisfaction over other SMTP implementations. It is a complete SMTP implementation. OpenSMTPD was developed primarily by Gilles Chehade, Eric Faurot and other OpenBSD hackers.

In a few minutes you can install a fully-functional mail server, while scripts do the rest of the work. The package is designed to be easy to use, with defaults that are reasonable. This allows you to get up and running quickly without having to learn the internals or make decisions that may break your email system. Binaries and user data are strictly separated. The user database is stored as a SQLite database in a file. Poste.io is therefore fully compatible with external storage. Migration, backups or upgrades are therefore very simple and mainly consist of file manipulation. Poste.io was built with security at the forefront. Internet history is full of painful security incidents. We traded in old email client compatibility for features that are more secure and meet modern security requirements.

Horde is the world's most flexible groupware, making it the ideal platform for building your business productivity software. Horde is the only open source groupware that connects to and supports more backends than any other system. This allows you to continue using your existing userbase, and your users will not need to remember any new passwords. Horde's feature-set rivals that of the largest enterprise email system. We have a feature set that is superior to any other competitor in our primary apps, such as mail, calendar, and address book, and even more in secondary apps, such as time tracking, wiki and ticketing.

Haraka can handle thousands of connections simultaneously and deliver thousands messages per second. Haraka and its plugins are both written in asynchronous JS, and are therefore very fast. Haraka is a very good filtering MTA and has excellent spam protection (see the plugins). It also works as an MSA on port 587, with auth and Dkim_sign enabled. Haraka does not claim to be an IMAP or LDA server (like Dovecot, courier or Dovecot), or a mail store like an exchange (or postfix/exim/qmail). Haraka is commonly used with these systems. Haraka comes with a built-in scalable outbound delivery engine. Mail marked for relaying (e.g. via an auth plugin), is automatically queued up for outbound delivery. Haraka's plugin-based architecture allows for an easily extensible MTA to complement traditional MTAs, which excel at managing mailboxes but lack sufficient filtering.

Installing your own email server will give you more control and privacy. It takes less than 10 seconds! Modoboa allows you to create your own mail server in just 10 minutes. You have a few options when it comes to creating a mailbox: - Subscribe to the services of infrastructure providers such as OVH and Gandi ...) or Internet providers like Orange, Vodafone ...). The customization and configuration options, domains, and mailboxes are limited. Use free email services (Gmail , Live, Yahoo ) which are limited in their functionality and your data may be used for commercial purposes. Install your own email system. This requires a good amount of technical knowledge in order to set up and configure the system. Modoboa offers an alternative to these 3 options. It allows you to create your own secure email server and is independent of email providers. It's all done in less than 10 mins and for free.

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

CommuniGate Pro is the platform that enables Unified Communications technology from start to finish. The system allows large-scale Unified Communications and integrates with business applications via open API's. CommuniGate Pro scales dynamically up to 100's of million accounts. It is ideal for multimodal communications within web applications and compartmentalized high security network topologies. But, large scale does not necessarily mean sacrificing efficiency or reliability. The platform is highly adaptable for resilient applications in embedded or military environments. CommuniGate Pro is approved by the USA and Europe for use by governmental agencies. For mind-bending stability and uptimes like VMS, military, transportation, and research center use is legendary. CommuniGate Pro allows banks to send mail to millions of customers for online self-care while adhering to compliance regulations. A hybrid system can deploy the signaling features of a server.

Secure, enterprise-style email and collaboration without the high price. Kerio Connect offers all the functionality and features for collaboration and messaging without the complexity or high price tag of other systems. Email integration includes shared calendars, scheduling, contacts management and tasks. It also integrates with instant messaging and shared folders. Microsoft ActiveSync allows you to sync messages directly to your mobile device. Instant Messaging can be used from any 3rd party chat/IM application on mobile and desktop. Kerio Connect can be installed in just 10 minutes. Users can also be up and running in as little as 10 minutes. Kerio Connect is available on-premises and in partner-hosted cloud environments. You can deploy for Mac, Windows, and Linux users. Full support for Outlook (Windows, Mac), and many other IMAP and POP compliant email client.

Oracle Communications Messaging Server, a standards-based Internet message server, is designed to handle high-capacity messages reliably for service providers and customers. Messaging Server supports several email protocols, and can manage embedded sound, graphics, videos, and other file formats and files.

Cyrus IMAP serves as an email, calendar and contacts server. Cyrus is open source and free. Features: Speed up Security Efficiency Search Engine CardDAV and CalDAV Support Data storage that is robust Replication Scalable for large installations Sieve provides flexible filtering support Supports anti-spam and antivirus toolkits Handles deliverability: SPF, DKIM, DMARC Cyrus SASL offers a wide range of authentication options JMAP Support List of standards supported

WinGate Proxy Server, a highly capable HTTP Proxy Server, SOCKS Server, integrated Internet Gateway and communications server, is designed to meet today's access control, security, and communication needs. WinGate Proxy Server offers a wide range of features and license options that allow you to adapt to your budget. WinGate Proxy Server can share any type of Internet connection. This allows multiple users to surf the internet, retrieve email, and use other internet programs as if they were connected directly to the Internet. WinGate Proxy Server will make sure that your connection is as fast and reliable as possible, no matter if it's a dialup modem or high-speed fibre. WinGate Proxy Server supports many Internet protocols, including messaging software, FTP, SSL, and Web browsers.

We offer a digitally sovereign solution that allows you to keep track of your e mails and calendars, organize your tasks, and stay in touch with colleagues via video conference. Kopano Groupware, an e-mailing and calendaring system that can be operated digitally sovereign, is available. It has similar functionality to Microsoft Outlook and Exchange. Kopano Groupware can be used with more than 100,000 users. Kopano Groupware provides users with e-mail and calendar access. It connects teams and allows them to communicate and share their organizational data across all devices. Data can be edited together in public folders, or shared with others using your own inbox.

Your customers can enjoy secure, business-level email hosting and other value-added services. This is a great solution for SPs and can be used by thousands to millions of users. You can acquire new customers by offering a premium mail server solution that allows you to automate your existing infrastructure. A secure and powerful mail server allows you to manage your email, share and organize your calendars, and sync your mobile devices. This is the perfect solution for businesses of any size. Axigen is very knowledgeable. Take a look inside to see which hats it has on. You can manage your email and make it easy to get things done with tasks, calendars, and notes. Desktop usability is possible in your browser using keyboard navigation and shortcuts. Drag-and-drop, live email list view, frequent folders. Email filters. Out-of-office messages. Individual blacklist /whitelist.

qmail is an efficient, reliable, and simple message transfer agent. Security is not just a goal but a requirement. Users cannot turn off mail delivery, so it needs to be secure. The straight-paper-path philosophy of qmail ensures that a message, once accepted into the system will never be lost. qmail can optionally support maildir, an ultra-reliable new user mailbox format. Maildirs will not be corrupted by a system crash, unlike mbox and mh files. Not only can an NFS client safely deliver mail to a user, but it can also be used by multiple clients at the same time. qmail is much smaller than any Internet MTA. Other MTAs use separate mechanisms for forwarding, aliasing and mailing lists. qmail offers a simple forwarding feature that allows users to manage their own mailing lists.

Secure and private email, calendars, and other information. 100% Free and Open Source Software (FOSS). All storage and communication can be done using open standards and formats. No vendor lock-in. All data are stored under Swiss jurisdiction. Without user consent, data are never given to third parties. GDPR, HIPPA, and PCI compliant. Built from the ground up. Perfect forward secrecy (PFS) is supported. End-to-end encryption is available. There are no back doors. Our documentation includes answers to the most common questions, as well as many other useful information. Our Knowledgebase has the answers to most frequently asked questions. You can always contact support if you don't find the answer to your question in our documentation.

An operating system and applications are included with your phone, tablet, or computer. Why not put them on your server as well? ClearOS is being redefined by HPE with the introduction of HPE ProLiant servers. ClearOS is an open-source, affordable operating system that is simple and easy to use. It features a graphical web-based user interface, an application marketplace, and over 100 apps. There are more being added daily. Open source software allows you to choose the applications you want and only pay for what you use. ClearCenter and HPE make it possible for small, home-based, remote, or branch offices to have a server available immediately, without additional cost. ClearOS and HPE ProLiant combine to offer a simple, secure, and affordable experience. It's never been easier to create the IT solution that's right for you.

Open source softwares are the best way to build a mail server. Works on CentOS Stream (Rocket, Alma), Debian, Ubuntu and FreeBSD. You can deploy a FREE, OPEN SOURCE, FULLY FURNISHED, FULL-FEATURED email server in a few minutes. We did all the heavy lifting by combining open source components and applying best practices. Our product takes care of all the major tasks. We also offer professional support in case of any problems. You can control email security and view the transaction log. No one else can read the content of your messages. All components in iRedMail come from open source softwares. You get bug fixes and updates directly from the Linux/BSD vendors you trust. iRedMail allows you to build a mail server using open source softwares.

James is the Java Apache Mail Enterprise Server. It is based on a modular architecture that consists of a set of modern, efficient components. This provides a stable, secure and extendable Mail Server running on JVM. You can create your own solution for email treatment using the Inversion of Control platform and customize filtering and routing rules with the James Mailet Container. The Apache James project combines the libraries that make up James to create running services. These are available for download from the Apache mirrors.

Mailtraq Professional is a complete email server. It is a complete email server that does everything you require at a low price and without hassles. Mailtraq is a great Microsoft Exchange Alternative. It's easy to install and manage. Mailtraq's low license cost, lack of server-CALs and stability make it the ideal email server software for SMBs and SOHOs. Email is the lifeblood of any company or organization. The location of these messages is crucial to the long-term success of your business. Running your own email server is not without its hassles and costs, but it allows you to control who has access. If you use the service of your ISP, their system administrators will be able to see and read all your messages. If you use SAAS for a hosted service and if using a Cloud provider, you don't only not know who is reading your emails, but you don't even know what country it is stored in.

Analyzes all web traffic, blocks selected websites via HTTP or HTTPS using Squid proxy. Integrated with ClamAV antivirus. Multi-domain web server with ready-to-use LAMP stack. Virtual hosting allows you to host multiple domains on one server. NextCloud allows you to access your files from anywhere, whether you're on the internet, your computer, or your mobile device. Mattermost allows you to create a private Slack-alternative. Secure team collaboration is possible with this open-source messaging platform. Cockpit is a modern web interface that simplifies administration tasks. It's easy to install and very fast. CentOS/RHEL is a popular server distribution that is trusted by routine security updates and has rock-solid stability.

Exim is a mail-transfer agent (MTA), which can be used in Unixllike operating system. Philip Hazel wrote the first version in 1995 for the University of Cambridge Computing Service's email systems. Exim is available under the GPL and is free to download and modify. Exim is somewhat similar to Smail 3. However, it has diverged from it and now exceeds it in ease-of-use and flexibility. Both follow the Sendmail design model, where one main binary controls all facilities of the MTA. Some consider this monolithic design to be less secure and slower. However, Exim's security record and speed are better than Sendmail. It excels in advanced areas like address routing, queue handling, and testing. Exim does not have a Graphical User Interface (GUI), but some Linux distributions do.

Philippe Gilbert's vision led to Alinto being born in 2000. His risk paid off! He brought together a team that included passionate developers and experts in cloud messaging to innovate the sector. He launched the first messaging platform in Europe with a Cloud-based email solution and the first mobile-friendly web-based email. We became a major player within the European digital market. Our R&D, Marketing, and Support teams, as software mail server providers, are committed to a focus on availability and proximity. This is more than just an electronic communication system. Our personalized care and solutions are tailored to your needs and requirements. Our experts are available to assist you at all times. We are available to help you, whether you are a telecom operator, internet service provider, or IT specialist.

KumoMTA, a high-performance and highly flexible sending platform, is available under an Open Source license for high-volume email users looking to replace PowerMTA, Momentum, or traditional Open Source MTAs.

You can offer a high-value Outlook experience with push mail, PIM and group calendaring. With lower server counts and attractive subscription pricing, you can increase margins. A Linux-based platform will help you reduce licensing costs and make your team's existing skills more valuable. Scalix starter packs provide small businesses and organizations with a robust, single-server messaging solution. Scalix small business edition, our single-server solution for small businesses, is the Scalix small business edition. It offers a wide range of business functionality, including the ability to quickly recover deleted items on a user specific basis, wireless device support, and many other features.

Xeams, a secure and powerful complete email server for Windows, Linux Solaris, MacOSX, and other flavors UNIX, is available. Xeams supports SMTP and POP3, as well as IMAP. It has a powerful spam filtering engine which eliminates up to 99 percent of junk mail upon installation. It is very user-friendly because it offers a flexible approach to email.

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.

Microsoft SMTP Service (also known as Microsoft Windows Server SMTP) is a software mail server that allows Microsoft Windows Server to send and receive email. It is part of Internet Information Services (IIS), and is used to relay email between mail servers. Microsoft SMTP Service has become a popular option for organizations who need a reliable, scalable mail server. It is easy-to-install and configure, and can be used by a variety email clients. Microsoft SMTP Service offers a variety of features including: Microsoft SMTP Service relays emails between servers. This means it can be used for sending and receiving emails from multiple domains. Microsoft SMTP Service supports multiple email clients. This includes Microsoft Outlook, Mozilla Thunderbird and Apple Mail. Microsoft SMTP Service offers a number security features such as encryption and authentication.

KingSMTP (formerly known as Kingmailer, founded in 2017) is a simple and fully featured mail server / SMTP service for use by anyone, not just developers. Start sending, receiving or routing your emails with a few clicks.

You are a growing company and need to keep in touch: email is essential. You're often stretched thin and have to face daily challenges. You need support. You've come to the right place. GMS has been around ever since the dawn of email. We have a lot of experience in understanding customers and providing the best service. We are like you: We care about your business. We don't like jargon and don't like confusion. GMS is the perfect email solution for small businesses with all the support you could need. Businesses and individuals don't have to worry about space, power, or software updates once they are part of the Cloud. Cloud computing eliminates the need for physical storage or maintenance, which means that the total cost of ownership will be significantly lower.

Mailcow: Dockerized is a free and open source groupware/email system based on Docker. Mailcow is based on a number of well-known and long-used components that, when combined, result in a carefree email server. Each container represents an application connected by a bridged network.

eSoftTools IMAP Migration and Backup Software is a reliable tool designed to backup and migrate emails efficiently from IMAP servers. Its user-friendly features and advanced interface offer a seamless experience to users who want to securely backup or transfer their important emails to a new email client or server. This software supports multiple IMAP server, allowing users connect and backup email from popular email services like Gmail, Yahoo Mail or Outlook.com. It is a reliable, efficient way.

Halon MTA makes your company more competitive by delivering important emails promptly and implementing features quickly. You will also reduce your development and maintenance costs by up to half. The Halon MTA allows for flexible email operations and security. It allows large-scale organizations to offer competitive features through rapid implementation. Halon MTA consolidates email infrastructure, reducing complexity and risk. It makes email infrastructure easy to manage, scalable, and rich in functionality. Poor customer experience due to slow and expensive implementation of new standards and email features. Halon improves email service competitiveness through rapid implementation and reliable deployment. Halon's holistic approach reduces system complexity, in contrast to traditional layers of email infrastructure.

H-Sphere is a multi-server, scalable web hosting solution. It offers many advanced features and a sophisticated billing platform to automate and improve web hosting tasks. H-Sphere can be used on multiple servers and can be scaled to add more web, mail and database servers without any downtime. It offers a simple and easy-to-use web interface, which can be accessed from any computer that has an internet connection. H-Sphere is written in Java and can be used with any SQL-compliant databases. It only runs industry-standard software. H-Sphere uses a centralized model that allows for maximum control. The centralized database stores the data. The control panel server sends commands (using ssh and http protocols) to different servers. You can add new servers at any time. The control panel server manages all users, domains, new machines, and events behind-the-scenes.

SquirrelMail, a webmail package that uses PHP standards, is written in PHP. It has built-in PHP support for the IMAP/SMTP protocols. All pages render in pure HTML 4.0 (with zero JavaScript required) to ensure maximum compatibility across browsers. It is extremely easy to set up and configure. SquirrelMail offers all the functionality you'd expect from an email client. It supports strong MIME support, address book management, and folder manipulation. Our organization needed to be able to access email and address books from anywhere in world. A web interface is the best option for this purpose, as long as the user has internet access. After looking at several open-source projects, we realized that we would need to make some major customizations in order to make it work for us.

RainLoop Webmail is a great choice for email solutions because it has minimal system requirements, decent performance and requires no database. Modern user interface. Complete support for IMAP and SMTP protocols, including SSL and STARTTLS. Sieve scripts (Filters, vacation message). Requirements for resources are minimal. Direct access to the mail server is possible. Mails are not stored locally on the web server. Multiple accounts can be added to the primary account. You can also access different accounts from different browser tabs simultaneously. Additional identities. Administrator panel to configure main options. Very simple installation and updating. Integration with Facebook, Google and Twitter. Manage folders. Easy customization. Multi-level caching system. Plugins can be added to the admin panel to extend functionality. Complex HTML mails rendered flawlessly Drag-and-drop for attachments and mails.

Trojita, an email program ("client") that provides fast and efficient access over IMAP protocol to mailboxes, is called Trojita. An IMAP mail server stores messages, and clients can fetch them to their local computers when requested. It places efficiency, speed, and open standards first. Trojita is multi-platform and works well on all platforms, from large desktop computers to small smartphones. Trojita is an independent program and not part of any "personal information management" suite.