Sendmail alternatives and similar software solutions

Based on the "Mail Transfer Agents" category.

Postal

9.2 4.8 Sendmail VS Postal

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

9.1 2.9 Sendmail VS MailHog

Web and API based SMTP testing

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MailCatcher

8.3 6.5 L5 Sendmail VS MailCatcher

Catches mail and serves it through a dream.
Haraka

8.1 6.9 L3 Sendmail VS Haraka

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

5.5 0.0 Sendmail VS Maildrop

Disposable email SMTP server, also useful for development.
Exim

5.2 8.9 L1 Sendmail VS Exim

Exim Mail Transport Agent - source, testsuite and documentation
OpenSMTPD

4.5 5.1 L2 Sendmail VS OpenSMTPD

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

3.0 2.3 L5 Sendmail VS Slimta

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

1.9 0.0 L1 Sendmail VS Courier MTA

Courier Mail Server
Lightmeter

1.0 0.0 Sendmail VS Lightmeter

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

1.0 0.0 Sendmail VS Qmail

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

- Sendmail VS chasquid

SMTP
Postfix

- Sendmail VS Postfix

Fast, easy to administer, and secure Sendmail replacement.