Postfix alternatives and similar tools

Based on the "Mail Servers" category.

Mail-in-a-Box

8.7 7.8 L3 Postfix VS Mail-in-a-Box

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
MailCatcher

7.5 5.2 L5 Postfix VS MailCatcher

Catches mail and serves it through a dream.

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Haraka

7.3 8.4 L3 Postfix VS Haraka

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

5.3 9.6 L3 Postfix VS Dovecot

Dovecot mail server
Exim

4.8 9.5 L1 Postfix VS Exim

Exim Mail Transport Agent - source, testsuite and documentation
Maildrop

4.6 0.0 Postfix VS Maildrop

DISCONTINUED. Open Source disposable email SMTP server, also useful for development.
OpenSMTPD

4.4 8.5 L2 Postfix VS OpenSMTPD

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

3.2 0.0 Postfix VS snmp_mib_archive

An archive of over 3000 unique SNMP MIBs
Qpopper

- Postfix VS Qpopper

One of the oldest and most popular server implementations of POP3.
Qmail

- Postfix VS Qmail

Secure Sendmail replacement.
Sendmail

- Postfix VS Sendmail

Message transfer agent (MTA).
Cyrus IMAP/POP3

- Postfix VS Cyrus IMAP/POP3

Intended to be run on sealed servers, where normal users are not permitted to log in.
iRedMail

- Postfix VS iRedMail

Full-featured mail server solution based on Postfix and Dovecot.
Courier IMAP/POP3

- Postfix VS Courier IMAP/POP3

Fast, scalable, enterprise IMAP and POP3 server.