Self Hosted Mail Transfer Agents

9.2

6.5

Postal

9.1

0.0

MailHog

8.4

4.4

MailCatcher

8.1

7.1

Haraka

5.5

0.0

Maildrop

5.3

9.4

Exim

14 Mail Transfer Agents software solutions and projects

Postal

9.2 6.5 Ruby

✉️ A fully featured open source mail delivery platform for incoming & outgoing e-mail
MailHog

9.1 0.0 Go

Web and API based SMTP testing

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MailCatcher

8.4 4.4 L5 Ruby

Catches mail and serves it through a dream.
Haraka

8.1 7.1 L3 JavaScript

A fast, highly extensible, and event driven SMTP server
Maildrop

5.5 0.0 CSS

Disposable email SMTP server, also useful for development.
Exim

5.3 9.4 L1 C

Exim Mail Transport Agent - source, testsuite and documentation
OpenSMTPD

4.6 6.1 L2 C

This is official OpenSMTPD Portable repository. Forks, pull requests and other contributions are welcome!
Slimta

3.1 3.6 L5 Python

Python libraries to send, receive, and queue email.
Courier MTA

1.9 2.8 L1 C

Courier Mail Server
Lightmeter

1.0 0.0

Lightmeter uses GitLab, not GitHub -- find repos at: https://gitlab.com/lightmeter
Qmail

1.0 0.0

Bind to different local ip addresses depending on the domain part of the sender argument when using `qmail-remote`.
Sendmail

-

Message transfer agent
chasquid

-

SMTP
Postfix

-

Fast, easy to administer, and secure Sendmail replacement.