Mailismus is a high-speed, high-volume mailserver which supports SMTP, IMAP and POP3.

It is secure (supports SSL and STARTTLS, plus SMTP-Auth with SASL), highly configurable, supports Maildir mailbox format, provides numerous anti-spam measures (eg. blacklisting, greylisting, DNS-based address validation) and offers extensive logging, auditing and transcript options.

The built-in IMAP and POP3 servers also support SSL, STLS and SASL-based authentication, and Mailismus also includes an SSL-capable POP3 downloader, which can be scheduled to run at recurring intervals.

Supports web-enabled monitoring and managing.