Best Free SMTP Services 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.

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.

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.

Bird, previously known as MessageBird, represents the future of CRM tailored for Marketing, Sales, and Payments, facilitating more than 5 trillion messages each year across platforms like Email, SMS, and WhatsApp. Top brands efficiently enhance their growth through Bird by engaging in tailored interactions across these channels. Innovative organizations around the globe utilize Bird's robust applications and APIs to create effective communication solutions. Start your journey today and connect with your customers seamlessly across various channels, catering to diverse use cases regardless of location. You can send marketing messages, push notifications, order confirmations, delivery updates, and much more. If operational challenges are hindering your growth, leverage automated conversations and workflows to gather essential information upfront, minimize manual tasks, establish self-service options, and direct chats to the appropriate agents. With our dependable, auto-scaling APIs, you can quickly get started with extensive documentation, comprehensive API references, and user-friendly SDKs at your disposal. Experience the power of streamlined communication and watch your business thrive.

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.

Amazon Simple Email Service (SES) offers an economical, adaptable, and scalable solution for sending emails from various applications. It allows quick configuration to cater to multiple email scenarios, such as transactional messages, marketing campaigns, or large-scale communications. The service enhances deliverability and safeguards sender reputation through its flexible IP deployment and email authentication features, while sending analytics provide insight into email performance. With Amazon SES, users can securely send emails on a global scale and handle large volumes effortlessly. Whether utilizing the Amazon SES console, APIs, or SMTP, you can set up email dispatch in just a matter of minutes. Additionally, Amazon SES enables email reception, facilitating effective customer engagement on a large scale. Importantly, you only incur costs based on your actual usage of the service, making it a budget-friendly option for businesses of any size. Furthermore, this service is designed to meet the evolving needs of developers and marketers alike, ensuring they can communicate effectively with their audiences.

EmailSuccess provides high volume email sending with enterprise-level SMTP Servers. EmailSuccess can be used as a Mail Transfer Agent (MTA) for all sizes of senders: ESPs and Marketing Automation Companies. High Performance EmailSuccess, an MTA, is designed to deliver large volumes of email. It gives the business full control over the Speed, Latency and Deliverability parameters. Deliverability Clients must be able to deliver their messages quickly. You must ensure that your email is not blocked by spam filters and lands in your inbox. Advanced Sending Intelligence Optimized delivery through automatic and real-time tuning of email delivery parameters; platform tuning is made easy.

MailerSend is a transactional messaging service designed for developers to work faster and smarter. Intuitively designed so anyone can contribute to transactional email and SMS, while powerful infrastructure and flexible payment plans let you scale quickly. Built by deliverability experts to ensure your messages get delivered, plus dedicated IPs available for high-volume senders.

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.

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.

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.

SMTP2GO is a reliable outgoing email service that allows you to track and send all emails securely and easily. SMTP2GO has a redundant, multi-data center infrastructure that allows users send emails even during an internet outage. SMTP2GO features include real-time analytics and bounce/spam tracking, weekly summaries spamtrap detection, blacklist monitor, DKIM/SPF and many other features.

SocketLabs, an email delivery engine that is reliable and easy to use, allows companies of all sizes to send transactional and marketing emails quickly and easily. Trusted by major organizations like Virgin and the American Red Cross SocketLabs offers a feature-rich outgoing email server delivery solution, an easy to use dashboard interface, and an even simpler setup. It also includes advanced analytics, outgoing mail servers, and top-notch customer support.

Recognizing the crucial impact of marketing on business success, we have developed our Instant Bulk SMTP service, which enables you to launch your email campaigns in under 30 minutes. You can efficiently manage multiple contact lists with options to add, remove, delete, and import or export your data seamlessly. Our platform provides detailed email analytics, allowing you to monitor bounces, opens, and click-through rates effectively. Integrating with your applications is straightforward, and upgrading to a higher plan is hassle-free. Instant Bulk SMTP serves as an outgoing email service, empowering you to send emails from your own address, regardless of whether you have your own software. Unlike conventional email marketing solutions, our high-volume SMTP hosting allows you to send emails directly from your application server, email client, or even a mix of different sources, giving you unparalleled flexibility. This innovative approach ensures that your marketing efforts are both efficient and effective, helping your business thrive in a competitive landscape.

Email marketing services empower your business to reach out to consumers at any time you choose. While it's not essential for every communication to be a direct sales approach, maintaining contact with customers should always offer them something beneficial. If you're on the lookout for a transactional SMTP service, you likely have an application designed to dispatch either marketing or transactional emails and are in need of a reliable host to send these messages in large volumes. You can build fully automated campaigns utilizing an incredibly user-friendly workflow builder that enables you to apply tags, trigger campaigns, introduce delays, and implement if-then logic, among many other features. This robust functionality enables businesses to operate efficiently and effectively. Enhance your sales through email marketing that truly connects with your audience, while our platform assists in nurturing leads by assigning points, ultimately transforming them from prospects into loyal customers. By leveraging these capabilities, your business can create a more engaging and impactful email marketing strategy.

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.