Postfix

postfix.org · checked 8 Oct 2026

#10 · Email Server Software #14 · Mail Server Software

Visit postfix.org ↗ Alternatives Postfix vs Mail-in-a-Box

How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Email Server Software6.1#10 of 33

Postfix aims to be fast, easy to administer, and secure.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: postfix.org
Price: Free tier
Free trial: No
Community support: The postfix-users mailing list is for use questions, problem reports, and feature requests; the project describes participants as volunteers.
Container support: Postfix supports running as PID 1 in a Linux container and logging to stdout.
Database lookups: Optional lookup-table support includes LDAP, MongoDB, MySQL, PostgreSQL, and SQLite, with support depending on build configuration.
Data sources: Postfix supports lookup databases including LDAP, MySQL, PostgreSQL, SQLite, LMDB, and MongoDB.
Deployment: Postfix is built from source and runs on UNIX-like systems; operating-system and appliance vendors also distribute ready-to-run versions.
Deployment limit: Postfix is mail server software described for UNIX-like systems, rather than a hosted email service.
Documentation: The project provides documentation for configuration, troubleshooting, content inspection, SMTP access control, and database lookup tables.
Email security: Postfix supports opportunistic DANE TLS, which verifies server certificates using DNSSEC TLSA records.
Filtering: Postfix supports content filters and the Sendmail Milter mail-filter protocol.
Integrations: The add-on directory lists third-party tools for authentication, content filtering, policy services, webmail, and other functions; entries are maintained by their authors without formal evaluation.
Intended users: The project describes postfix-users as a forum for people using Postfix and postfix-devel as a list for those designing, implementing, or maintaining its source code.
Junk-mail controls: Its listed controls include per-client rate and concurrency limits, access controls, DNS-based lists, and postscreen zombie blocking.

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