- Source RPM packages ready for RPM based distributions
- SMTP with SMTP-AUTH, TLS, REMOTE-AUTH
- DomainKeys, SPF "Sender Policy Framework" and SRS "Sender Rewriting Scheme"
- Integrated SpamAssassin, ClamAV and Simscan
- Warlord virus and worm loader realtime scanning
- CHKUSER 2.0 functions for qmail-smtpd
- Qmail-Tap provides email archive capability
- Virtual Domains (MySQL), Virtual Users (MySQL)
- Autoresponder, Mailing List
- Web-based email system, Web-based administration tools
- POP3, POP3-SSL, IMAP and IMAP-SSL
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