List of mail servers

This is a list of mail servers: mail transfer agents, mail delivery agents, and other computer software which provides email services.

SMTP

• Sendmail
• Postfix
• qmail
• Exim
• Microsoft Exchange Server
• Kerio MailServer

POP/IMAP

• UW IMAP - uses mbox format.
• Courier IMAP - uses Maildir format.
• hMailServer - MySQL-based, open source, GPL for MS Windows
• Microsoft Exchange Server
• Kerio MailServer

Mail filtering

• Procmail
• Vipul's Razor
• SpamAssassin
• Bayesian Filters