Postfix

What it does

Community support

The postfix-users mailing list is for use questions, problem reports, and feature requests; the project describes participants as volunteers.checked 8 Oct 2026

Container support

Postfix supports running as PID 1 in a Linux container and logging to stdout.checked 8 Oct 2026

Database lookups

Optional lookup-table support includes LDAP, MongoDB, MySQL, PostgreSQL, and SQLite, with support depending on build configuration.checked 8 Oct 2026

Data sources

Postfix supports lookup databases including LDAP, MySQL, PostgreSQL, SQLite, LMDB, and MongoDB.checked 8 Oct 2026

Deployment

Postfix is built from source and runs on UNIX-like systems; operating-system and appliance vendors also distribute ready-to-run versions.checked 8 Oct 2026

Deployment limit

Postfix is mail server software described for UNIX-like systems, rather than a hosted email service.checked 8 Oct 2026

Documentation

The project provides documentation for configuration, troubleshooting, content inspection, SMTP access control, and database lookup tables.checked 8 Oct 2026

Email security

Postfix supports opportunistic DANE TLS, which verifies server certificates using DNSSEC TLSA records.checked 8 Oct 2026

Filtering

Postfix supports content filters and the Sendmail Milter mail-filter protocol.checked 8 Oct 2026

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.checked 8 Oct 2026

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.checked 8 Oct 2026

Junk-mail controls

Its listed controls include per-client rate and concurrency limits, access controls, DNS-based lists, and postscreen zombie blocking.checked 8 Oct 2026

Mail protocols

Postfix supports SMTP and LMTP features including SASL authentication, TLS, IPv6, and SMTPUTF8.checked 8 Oct 2026

Operating systems

The project says source-built Postfix can run on UNIX-like systems including AIX, BSD, HP-UX, Linux, MacOS X, and Solaris.checked 8 Oct 2026

Optional build features

Third-party database and other optional features may need to be enabled when Postfix is compiled.checked 8 Oct 2026

Product

Postfix is Wietse Venema’s mail server, created as an alternative to Sendmail.checked 8 Oct 2026

Purpose

Postfix aims to be fast, easy to administer, and secure.checked 8 Oct 2026

Release maintenance

The September 7, 2026 announcement lists stable release 3.11.7 and legacy releases 3.10.14 through 3.5.28.checked 8 Oct 2026

Security limitation

The project notes that enabling TLS support also enables OpenSSL library code, which adds external code to the system.checked 8 Oct 2026

SMTP security

Postfix supports TLS encryption and authentication for SMTP sessions and SASL authentication.checked 8 Oct 2026

Spam defenses

The feature overview lists access controls, greylisting, SPF plug-ins, and postscreen defenses against unwanted SMTP clients.checked 8 Oct 2026

Support

The postfix-users mailing list is for questions, problem reports, and feature requests; non-member postings are silently discarded.checked 8 Oct 2026

TLS security

Postfix TLS support can encrypt SMTP sessions and authenticate remote SMTP clients or servers; mandatory TLS can also be configured.checked 8 Oct 2026