Features

• Manage any number of domains, mailboxes and aliases.
• Multiple domains can be grouped as a "site".
  If you have, for example, two domains domain1.tld and domain2.tld within site site1
  then mails to either of the two email addresses for user user (user@domain1.tld
  or user@domain2.tld) will be delivered to one mailbox.
• Autoreply (out of office) support.
• Mail accounts are independent from system accounts.
• Mailboxes can have quotas, which you can manage by reseller, site or user.
• Four different user-levels: Administrators, Resellers, Customers and Users
  - each user-level and each user can have individual restrictions
• Easy to use, web based GUI (front end)
• GUI based BIND (DNS server) configuration.
• Supports the Exim mail transfer agent.
• Supports the Courier-IMAP mailbox server, which provides POP and IMAP access.
• Supports the ClamAV or others virus scanners using SA-Exim and custom ACLs.
• Supports MailScanner and SpamAssassin.
• Supports any web-based mail user agent that uses POP or IMAP (RoundCube preferred).
• Supports following SMTP-AUTH modes: PLAIN, LOGIN and CRAM-MD5 with or without TLS.
• Uses MySQL for account storage.
• Uses CDB library for fast domain lookups in Exim.
• Source package includes PAM (Pluggable Authentication Modules) module, and SquirrelMail and RoundCube plugins.
• On configuration file to set-up all variables at install.
• Provides easy step-by-step installation guide for Debian 5.0 Lenny (no .deb yet!).

Please add feature requests at Sourceforge