WebThing Mailer

Features include: Unlimited users (may be "virtual" users, with no own account or POP mailbox, etc), Each user has unlimited mailboxes in an own namespace, Efficient internal mailbox (typically 100 times faster than Berkeley format - as used for POP), Folder manager, permitting automatic sorting of incoming mail, Addressbook/Workgroup Manager, Autoresponders, Mailing Lists, Mail Gateways, Programmable (regexp) processing, Read and send multipart, multimedia MIME messages, Personal Preferences: "signature" etc, Pre-written "form letter" templates available for composition, and User-configurable junkmail filtering of incoming mail.