Postfix
postfix.org
Spec sheet
- Purpose
- Postfix aims to be fast, easy to administer, and secure.Read 8 Oct 2026 · postfix.org
- Product
- Postfix is Wietse Venema’s mail server, created as an alternative to Sendmail.Read 8 Oct 2026 · postfix.org
- 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.Read 8 Oct 2026 · postfix.org
- Deployment
- Postfix is built from source and runs on UNIX-like systems; operating-system and appliance vendors also distribute ready-to-run versions.Read 8 Oct 2026 · postfix.org
- 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.Read 8 Oct 2026 · postfix.org
- Support
- The postfix-users mailing list is for questions, problem reports, and feature requests; non-member postings are silently discarded.Read 8 Oct 2026 · postfix.org
- Community support
- The postfix-users mailing list is for use questions, problem reports, and feature requests; the project describes participants as volunteers.Read 8 Oct 2026 · postfix.org
- Container support
- Postfix supports running as PID 1 in a Linux container and logging to stdout.Read 8 Oct 2026 · postfix.org
- Data sources
- Postfix supports lookup databases including LDAP, MySQL, PostgreSQL, SQLite, LMDB, and MongoDB.Read 8 Oct 2026 · postfix.org
- Database lookups
- Optional lookup-table support includes LDAP, MongoDB, MySQL, PostgreSQL, and SQLite, with support depending on build configuration.Read 8 Oct 2026 · postfix.org
- Deployment limit
- Postfix is mail server software described for UNIX-like systems, rather than a hosted email service.Read 8 Oct 2026 · postfix.org
- Documentation
- The project provides documentation for configuration, troubleshooting, content inspection, SMTP access control, and database lookup tables.Read 8 Oct 2026 · postfix.org
- Email security
- Postfix supports opportunistic DANE TLS, which verifies server certificates using DNSSEC TLSA records.Read 8 Oct 2026 · postfix.org
- Filtering
- Postfix supports content filters and the Sendmail Milter mail-filter protocol.Read 8 Oct 2026 · postfix.org
- Junk-mail controls
- Its listed controls include per-client rate and concurrency limits, access controls, DNS-based lists, and postscreen zombie blocking.Read 8 Oct 2026 · postfix.org
- Mail protocols
- Postfix supports SMTP and LMTP features including SASL authentication, TLS, IPv6, and SMTPUTF8.Read 8 Oct 2026 · postfix.org
- Operating systems
- The project says source-built Postfix can run on UNIX-like systems including AIX, BSD, HP-UX, Linux, MacOS X, and Solaris.Read 8 Oct 2026 · postfix.org
- Optional build features
- Third-party database and other optional features may need to be enabled when Postfix is compiled.Read 8 Oct 2026 · postfix.org
- Release maintenance
- The September 7, 2026 announcement lists stable release 3.11.7 and legacy releases 3.10.14 through 3.5.28.Read 8 Oct 2026 · postfix.org
- Security limitation
- The project notes that enabling TLS support also enables OpenSSL library code, which adds external code to the system.Read 8 Oct 2026 · postfix.org
- SMTP security
- Postfix supports TLS encryption and authentication for SMTP sessions and SASL authentication.Read 8 Oct 2026 · postfix.org
- Spam defenses
- The feature overview lists access controls, greylisting, SPF plug-ins, and postscreen defenses against unwanted SMTP clients.Read 8 Oct 2026 · postfix.org
- TLS security
- Postfix TLS support can encrypt SMTP sessions and authenticate remote SMTP clients or servers; mandatory TLS can also be configured.Read 8 Oct 2026 · postfix.org
Where Specifiction places it
- Mail Server Software#30 of 347.2
