Postfix

Postfix: A Secure, Easy-to-Administer, and Fast Sendmail Replacement

The Postfix project is a mail server that aims to provide a fast, easy-to-administer, and secure alternative to the widely-used Sendmail program. Initially developed at IBM research, Postfix was created as an alternative to Sendmail by Wietse Venema, who continues to maintain it even after eight years at Google.

Main Features of Postfix

Postfix's main features include:

• Standard email server: Supports IMAP and IMAP+, SMTP and Submission with auto-configuration profiles for clients
• Advanced email features: Aliases, domain aliases, custom routing, full-text search of email attachments
• Web access: Multiple Webmails and administration interface available
• User features: Aliases, auto-reply, auto-forward, fetched accounts, managesieve
• Admin features: Global admins, announcements, per-domain delegation, quotas
• Security: Enforced TLS, DANE, MTA-STS, Let's Encrypt!, outgoing DKIM, anti-virus scanner, Snuffleupagus (block malicious attachments)
• Antispam: Auto-learn, greylisting, DMARC and SPF, anti-spoofing
• Freedom: All FOSS components, no tracker included

Overall, Postfix aims to provide a reliable and secure email server solution that is easy to administer and configure.