In this article, we will take a look at some of the most 20 popular open source SMTP servers. An SMTP server is a server that handles the process of sending and receiving emails.

It works by using a set of rules to determine how to route emails between different servers. The most important rule is the one that determines the path that an email should take from its origin server to its destination server. This rule is called the Mail Transfer Agent (MTA) routing table.

The SMTP server is responsible for ensuring that all email messages are delivered to their intended recipients. It does this by using a variety of techniques, including DNS lookup, MX record lookup, and local delivery.

In addition, the SMTP server may also use a variety of other methods to ensure that email messages are delivered successfully.

The primary function of an SMTP server is to relay email messages from one server to another.

However, some SMTP servers also provide a number of other features, such as the ability to store and forward email messages, and the ability to filter email messages based on content or sender.

OpenSource Smtp servers
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What are OpenSource Smtp Servers?

Open source SMTP servers are a great way to get started with your own email server. There are many options available, and each has its own advantages and disadvantages.

20 Best OpenSource Smtp server

1. Postfix

Postfix is a free and open-source mail transfer agent that routes and delivers electronic mail. It is one of the most popular SMTP servers in the world. Courier MTA: Courier MTA is a free and open-source mail server that supports both SMTP and POP3.

2. Exim

Exim is a free and open-source mail transfer agent that is used on Unix-like operating systems. It is a free and open-source mail server that supports both SMTP and POP3.

3. Postal

Postal is a free and open-source mail server that supports both SMTP and POP3. Postal is designed to be simple and easy to use, with a focus on security and stability. Postal is developed by a team of experienced developers, and is available for Windows, Linux, and macOS.

4. hMailServer

hMailServer is a free and open-source mail server for Microsoft Windows. It supports both SMTP and POP3, and can be used with any email client. hMailServer is designed to be easy to set up and use, with a focus on security and stability.

5. iRedMail

iRedMail is a free, open source mail server solution for Linux and BSD. It provides all the features you need to set up a professional mail server, including SMTP, POP3, IMAP, webmail, spam filtering, and virus scanning. iRedmail is easy to install and use, and it is available for both 32-bit and 64-bit systems.

6. James

James is a free, open-source mail server that supports both SMTP and POP3. It is written in Java, and can be run on any platform that supports Java. James is designed to be easy to set up and use, with a focus on security and stability.

7. Modoboa

Modoboa is a free open-source easy-to-install email server solution based on Django. It provides all the features you need to set up a professional mail server, including SMTP, POP3, IMAP, webmail, spam filtering, and virus scanning. Modoboa is easy to install and use, and it is available in both 32-bit and 64-bit versions.

8. MailSlurper

MailSlurper is SMTP mail server for teams and software development. MailSlurper is a lightweight package for personal use, or for development and testing purposes. It is written in Go and available for Windows, Linux and MacOS.

9. Pony Mail

Pony mail is An SMTP server with a web interface that makes it easy to manage your email messages. Pony Mail is open source software released under the Apache 2.0 license. It is written in Java and available for Windows, Linux and MacOS.

10. Haraka

Haraka is an SMTP server written in node.js. Haraka is open source software released under the MIT license. It is available for Windows, Linux and MacOS.

11. DOVECOT

DOVECOT is a minimal open-source IMAP and POP3 email server for Linux/ Unix operating systems. It is available for free under the GNU GPL license.

12. WildDuck

WildDuck is an open source mail server with a focus on security and stability. It supports both SMTP and POP3, and can be used with any email client. WildDuck is available for Windows, Linux and MacOS.

 13. Cyrus Mail Server

Cyrus Mail Server is an open source mail server with a focus on security and stability. It supports both SMTP and POP3, and can be used with any email client. Cyrus Mail Server is available for Windows, Linux and MacOS.

14. MailEnable Standard

MailEnable Standard is a free open-source mail server for Microsoft Windows. It supports both SMTP and POP3, and can be used with any email client. MailEnable Standard is easy to install and use, and it is available in both 32-bit and 64-bit versions.

15. Cuttlefish

CuttleFish is an enterprise freshly developed mail server, It comes with all required infrastructure to run a seamless email server with elegant and well-designed web email client and web admin dashboard.

16. Mailu

Mailu is a lightweight but features-rich email server with minimal setup thanks to its Docker image. It supports both SMTP and POP3, and can be used with any email client. Mailu is available for Windows, Linux and MacOS.

 17. Salmon

Salmon is a free open-source mail server for developers. It supports both SMTP and POP3, and can be used with any email client. Salmon is available for Windows, Linux and MacOS.

18. Mailcatcher

Mailcatcher is a free open-source mail server for development and testing purposes. It supports both SMTP and POP3, and can be used with any email client. Mailcatcher is available for Windows, Linux and MacOS.

19. Magma mail server

Magma is a free and open source mail server that supports both SMTP and POP3. It can be used with any email client, and is available for Windows, Linux and MacOS.

20. Neutron Mail Server

Neutron is a server that will allow the ProtonMail client to be used with backends. Several backends are available right now:

  • IMAP: this will read and store messages on your IMAP server. Received messages will stay as is (that is, unencrypted) but messages saved from the web client will be encrypted. You will login to the web client with your IMAP username and password.
  • SMTP: this will send messages using your SMTP server. Messages are sent encrypted to the server. If a recipient’s public key is not found, the server will decrypt the message before sending it to this recipient.
  • Filesystem: settings, contacts, keys are stored on disk. Keys are always stored encrypted.
  • Memory: all is stored in memory and will be destroyed when the server is stopped.

Conclusion

There are many open source mail servers available, each with its own strengths and weaknesses. The best mail server for you will depend on your needs and preferences. Do some research and try out a few different servers to find the one that best suits your needs.

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