Best SMTP Services with a Free Trial of 2025

Introducing Brevo, previously known as Sendinblue — your go-to platform for enhancing customer connections through various channels like Email, SMS, and Chat. This comprehensive toolkit is designed to transform casual visitors into loyal customers. Engage your audience by reaching them directly in their inboxes with visually appealing email campaigns, and send tailored messages that go right into your customers' hands. Brevo enables businesses to cultivate and strengthen relationships through tools such as marketing automation, email outreach, transactional messaging, and SMS services. What sets us apart? Our exceptional customer happiness team drives Brevo, and our flexible pricing plans are sure to bring a smile to your face. With a seamless integration of diverse services in a single, easy-to-use platform, we strive to make your sending experience enjoyable and effective!

Partner with the email service trusted by developers and marketers for time-savings, scalability, and delivery expertise. The Twilio SendGrid Email API and proprietary Mail Transfer Agent (MTA), intuitive console, powerful features, and email experts make it easy to ensure all your email gets delivered in seconds and without interruption. Whether you’re sending 100 emails or 100 billion, SendGrid is built to scale, while maximizing inbox placement and protecting your reputation as a trusted sender. Monitor engagement data and optimize deliverability with our Deliverability Insights dashboard. Integrate with our RESTful APIs and SMTP in minutes, with sample code libraries available in 7 languages, interactive docs, templates, and more.

TurboSMTP understands that email is not just a means of communication but the backbone of your customer engagement strategy. TurboSMTP Email API is trusted by developers and marketers alike for its time-saving features, scalability, and delivery expertise. Our service offers a flexible SMTP relay solution along with advanced features tailored to meet the needs of businesses of all sizes. With our intuitive dashboard, powerful features, and dedicated support, ensuring the delivery of your emails is seamless and uninterrupted. TurboSMTP's infrastructure is built to scale, whether you're sending a few hundred emails or millions. Integration with our service is effortless, with sample code libraries available in multiple languages, interactive documentation, and customizable templates. TurboSMTP offers webhook integrations and automates actions based on email events, streamlining your workflow. Plus, our email validation tools ensure list accuracy, reducing bounce rates and improving deliverability. TurboSMTP not only prioritizes the reliability and efficiency of email delivery but also understands the importance of providing exceptional support to our valued customers. That's why we offer multilingual 24/7 support.

All the benefits of email marketing without the coding. We don't care about your size. We can help your business send powerful emails that get read and clicked on every occasion, no matter how big or small. They are also stunning. You can simplify your marketing tasks and reach all your goals with just a click. Moosend's advanced automation tools will save you time and help propel your email marketing forward. No more blah blah for your subscribers. Send them relevant emails that they want to read. This will increase your open and click rates. You can easily create stunning landing pages in minutes. Our feature-packed form editor makes it easy to grow your mailing list, collect valuable data and share your forms across all of your online channels.

Discover the email solution tailored for dynamic teams seeking efficiency. We understand the challenges of finding an affordable yet effective email service, and Mailjet emerges as the ideal choice for your requirements. Our cutting-edge features empower your business growth while remaining budget-friendly. With our user-friendly email editor, Passport, you can effortlessly design stunning, responsive emails in just a few clicks. Choose from our extensive collection of free email templates or unleash your creativity by designing from scratch. Enhance teamwork with Mailjet’s Collaboration Toolkit, allowing real-time collaboration on the same email template or campaign, thus boosting your team's productivity. Significantly reduce feedback loops with our commenting and approval workflow, enabling quicker turnaround times. Tailor each email using the customer data you gather and segment your contact list to ensure the right content reaches the appropriate audience. It’s simple to make every recipient feel valued and recognized. Furthermore, analyze the effectiveness of your campaigns with real-time statistics provided for each sending, helping you refine your strategies for even better results. With Mailjet, achieving email marketing success becomes not only possible but also straightforward.

Thousands of businesses are already utilizing Elastic Email for their email communications. This exceptional Email Marketing platform is designed on an extremely economical Email API. Factors such as deliverability, reliability, and scalability are crucial for success. You can effortlessly connect and dispatch your emails using our HTTP API or SMTP relay, accommodating growth to over 100 million emails each month on our high-speed global infrastructure. Each campaign allows you to foster stronger connections with your audience. Elastic Email equips you with all the necessary marketing tools to ensure your contacts feel engaged. Make the most of your email marketing efforts by crafting stunning emails, distributing newsletters, and automating your campaigns with remarkable speed, enhancing both efficiency and effectiveness. Furthermore, this platform prioritizes user experience, making it simple to implement and manage your email strategies.

Multi-channel marketing automation platform that allows marketers to create personalized promotional campaigns. You can choose from SMS, email, or web push notification. Or you can combine multiple channels into one campaign to create a complex message sequence. The platform offers all the tools necessary to automate email marketing. You can also create subscription forms and grow your mailing list. Drag and drop is intuitive and allows users to create mobile-friendly email templates. Or, they can choose from a large gallery of predesigned templates. The company also offers a transactional email service, which allows users to send up 12000 emails for free via SMTP and API. SendPulse offers its own chatbot creator. You can create a Telegram chatbot or a Facebook Messenger chatbot to send personalized messages or as an autoresponder.

Ongage serves as a comprehensive email marketing solution tailored for sophisticated marketers who aim to execute premium campaigns while deepening their audience insights. Both developers and those without technical expertise can launch high-volume campaigns thanks to its user-friendly dashboard that offers extensive control. Users can obtain valuable insights into customer behaviors, craft data-driven emails, and segment audiences based on specific intents. Additionally, Ongage allows for the creation of personalized experiences that respond to customer actions, featuring automated real-time emails designed to guide audiences toward desired outcomes. Acting as a complete hub for email deliverability, Ongage boasts a suite of features, analytical reports, and expert guidance that dissect deliverability from multiple perspectives. The platform enables seamless synchronization with your CRM, CDP, and data warehouse, enhancing the effectiveness of campaigns in real time. Users can easily connect to any SMTP relay or MTA, or utilize Ongage's integrated SMTP to send their messages. Furthermore, Ongage offers flexibility by allowing users to send emails from multiple SMTPs or just one, ensuring a tailored approach to email communication. This adaptability makes Ongage a powerful ally for marketers aiming to maximize their impact through effective email strategies.

Mailgun offers a robust email automation platform tailored for developers. By utilizing Mailgun, users can leverage a comprehensive cloud-based email service designed for sending, receiving, and monitoring emails generated through their applications and websites. The platform is compatible with a variety of programming languages such as Python, Ruby, PHP, Java, and C#. Additionally, Mailgun's tracking capability enables users to monitor all outgoing emails effectively, helping to minimize the likelihood of being classified as spam. This functionality not only enhances email deliverability but also provides valuable insights into user engagement.

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.

Mailify, a European-based email marketing and SMS software company, is an industry leader. This tool is ideal for companies looking to stand out among the crowd with its innovative features and expert advice. Mailify is a complete solution. It allows you to manage your contacts, segment your database and create email and newsletters. It supports plugins for the most popular platforms such as Wordpress and Google Analytics. Our EmailBuilder is flexible and fast, allowing you add and edit more content than other tools. Smart Templates saves you time by automatically adapting email and newsletter templates. Simply enter your URL to create a dozen templates that are based on it. We have improved features like the Heatmap, Predictive Eye tracking and many more. These features allow you to identify what has caught the eye of your target audience, predict their first impressions, and even track their eye movements.

Reliable delivery of your application emails. ActiveCampaign Postmark delivers your email on time and every time to customers. Customers expect transactional emails to arrive promptly, not later. We monitor our delivery times and share the data with the public. Our knowledgeable support team is always available to assist you, via 1-on-1 calls, webinars or email. Postmark integrates seamlessly into any stack thanks to its API libraries that support almost every programming language.

MailerQ is an efficient on-premise Mail Transfer Agent (MTA) designed to handle the delivery of millions of emails daily. With a strong emphasis on performance, usability, and data insights, it features a user-friendly Management Console, REST API, and essential tools for serious senders aiming to enhance their sender reputation and delivery success. This versatility is why MailerQ is quickly becoming the go-to choice for various senders, including Email Service Providers, e-commerce businesses, financial institutions, and government agencies. The Management Console provides real-time visibility into delivery attempts, results, queues, and error logs, allowing users to analyze performance per MTA, IP address, target audience, and even specific customers, campaigns, or message types. Additionally, the ability to track response patterns enables the classification of bounces, management of feedback loops, and adjustment of MTA behavior in response to server replies. As a result, users can significantly improve their email deliverability and maintain a strong sender reputation, ensuring their communications reach the intended recipients effectively. This comprehensive approach not only streamlines the email delivery process but also empowers senders to make data-driven decisions for ongoing improvements.

Implementing DKIM signing enhances the likelihood of your emails landing in the inboxes of providers such as Gmail and Office365. With multiple servers based in the USA and Europe, our service ensures enhanced reliability. Say goodbye to the stress of overseeing your own email server and managing its IP reputation. You can effortlessly create SPF and DKIM records for your domains, even without any prior experience. In the event of IP blacklisting, our SMTP relay service can effectively address your reputation issues. We offer round-the-clock technical support through phone, chat, or email, committed to guaranteeing the successful delivery of your emails. This means you will be able to consistently deliver your messages straight to the inbox. Our team meticulously optimizes sending routes while keeping a close eye on our IP reputations to provide you with the highest quality service. We uphold a Zero Spam Policy that enables us to block or limit messages that could jeopardize our reliability or your reputation. Additionally, once your domain ownership is verified through DNS, you can send emails from an unlimited number of "From" addresses or domains, giving you the flexibility needed for your communication needs. This comprehensive approach not only simplifies the email sending process but also enhances your overall email strategy.

-- The email engine you can build on -- We're everything that happens under the hood of your email communications. Reliable Email API with endless capabilities & features ready for integration. Flowmailer's Email Engine provides all the tools you need to build a professional email strategy. From marketing to customer support, from account management to warehousing, every email sent is valuable. Flowmailer is built for continuous high-performance, no matter the emails you're sending. Take away the difficulties of email delivery and focus on creating meaningful email communications with your customers. Email Delivery | SMTP & API | Infrastructure | Transactional Email

Sendcrux was founded in 2017 and specializes in email campaigns, with a particular expertise in cold emails. Our performance is what sets us apart, with industry-leading click and open rates. Our success is based on a dedicated, innovative team, a deep understanding audience engagement, and innovative strategies. We consistently outperform our competitors and deliver unparalleled results for clients. We are the first choice for businesses looking for high-impact, effective email marketing solutions. We will elevate your email campaigns and maximize engagement to drive exceptional results. Choose us to have a brighter and more prosperous future in marketing.

Track delivery, clicks and bounce rates in real-time. Welcome to the lightning-fast delivery of transactional emails. Create beautiful, responsive emails with our drag-and drop email template builder in minutes. Supercharge your emailing abilities with our fully-warm-up dedicated IP address. Receive real-time notifications regarding email events. Use our webhooks for tracking email delivery, bounces and more. Get detailed, real-time reports on emails sent and opened. Using valuable insights, you can enhance your user's experience. Manage bounced emails with ease while ensuring that recipients who received the emails are not contacted again. Use our email API or the traditional SMTP to send emails via HTTP requests. Our email API integrates seamlessly with your website or app to ensure that your emails are delivered directly to your inbox.

Choose the best email SMTP or API for the most robust delivery experience. Netcore Email API, formerly known as Pepipost, provides a powerful transactional inboxing and AI-powered email delivery infrastructure that is reliable, scalable and secure, and at the most affordable price plans. We help brands engage with their customers with the right content at the right time via emails.

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 Sentrion platform from sendmail is crafted for intricate and expansive environments, yet we also offer a portion of this solution as open-source. While Sentrion may not suit everyone’s needs, it is an excellent choice for those employing open-source email systems within large and complex infrastructures, as it can support your messaging strategy for the long term, encompassing aspects like virtualization, consolidation, and cloud migration. The Domain Keys Identified Mail (DKIM) standard plays a pivotal role in email security by allowing senders to digitally sign their messages, enabling recipients to verify that these messages are genuine and have not been tampered with. This sender authentication process ensures that recipients can trace the origin of an email back to the sender's domain, providing assurance regarding the integrity of the message content. Utilizing cryptography, DKIM offers a widely accepted solution for reducing email fraud, thereby safeguarding an organization's brand and reputation while keeping implementation costs manageable. With the increasing prevalence of email threats, adopting DKIM can be a crucial step in fortifying your email security framework.

Transactional emails: Reach your inbox when it matters most Send personalized, fast transactional emails via API or SMTP. Enjoy the benefits of our global experience sending billions upon billions of emails. Personalized transactional emails are sent to inboxes and not to spam folders. You can customize your analytics with pre-built dashboards and an export API. For assistance, consult our award-winning Support team or read the documentation guides. Use custom tagging and whitelabeling to create conditional content. Globally distributed infrastructure: Automatic SPAM loop registration and prewarmed dedicated IPs. Analytics can be accessed in many ways, including custom tags, A/B testing capabilities and comparative reports. White-labeled click tracking, custom reverse DNS and rules engine are available. Custom return path is also available. This is the average delivery time for top 3 ISPs. It was sent from our MTAs and to the recipient's mail server.

Elevate your Email Marketing strategy without breaking the bank. By utilizing a dedicated IP address, you can enhance your sender reputation and reduce the risk of being blacklisted due to the actions of others. This approach demonstrates authenticity, ensuring recipients know that the email is genuinely from your business and domain, while also significantly decreasing the likelihood of your messages being flagged as spam by employing advanced cryptographic signatures like SPF and DKIM. Our SMTP servers guarantee that your emails are dispatched through a secure SSL connection, and they do so at remarkable speed. You can track the performance of each mailing list, including the total number of emails sent, conversions achieved, and links clicked, along with a wealth of other insightful data. Additionally, our SMTP service provides comprehensive sending and delivery error reports that are easily downloadable to your device. Importantly, you can rest assured that your emails will not reach any unsubscribed recipients, even if they are listed elsewhere. This ensures that your emails consistently land in inboxes rather than getting lost in spam folders, ultimately enhancing your marketing effectiveness and engagement rates.

Utilizing an SMTP relay service such as Miogmail is an effective way to initiate the process of sending both marketing and transactional emails. You can dispatch messages based on specific triggers or conduct ongoing bulk email campaigns without interruption. The platform allows for the creation of visually appealing and customized email templates through an intuitive drag-and-drop editor, or you can opt for pre-designed responsive templates that fit your needs. Prioritizing security, the service ensures a robust email infrastructure that integrates SSL, DKIM, DMARC, SPF, and TLS for utmost protection. Additionally, you can enhance your email delivery rates with advanced management tools and a dedicated IP address. Whether you’re crafting personalized transactional, promotional, or newsletter emails, the platform provides the necessary resources. Furthermore, you have the option to leverage either transactional or promotional SMTP or SMTP API for the distribution of bulk emails efficiently. This flexibility allows businesses to reach their audiences effectively while maintaining a professional appearance in their communications.

Codermails is an email application created by Coder technologies, renowned for its excellence in email marketing. This versatile software is ideal for sending newsletters, promotional content, welcome messages, product updates, and more. Compatible with both Windows and Linux operating systems, it also features built-in statistics for open rates and click rates, allowing users to track their engagement effectively. Additionally, Codermails offers a user-friendly interface that simplifies the email marketing process for businesses of all sizes.