Ability Mail Server

Ability Mail Server is an advanced, secure and high performing mail server. Featuring SMTP, POP3, IMAP4, WebMail, Remote Admin, LDAP, SSL, SPAM Filtering with Bayesian, RBL filters, SPF, Grey Listing, Black and White Listing, Antivirus Filtering, Content Filtering, POP3 retrievals, ODBC, mailing lists, static routing, domain administrators, aliases, redirections, auto-responses, user filtering, multiple folders, address books, IPv6 support, clustering and much more.

Combines maximum functionality with ease of use.