XamimeLT is an email scanner which encapsulates your existing sendmail or Postfix server setup. It scans both incoming and outgoing email. It can scan for email viruses, unwanted file types (eg. EXE, BMP, MPEG) and file names (eg. prettypark.exe), spam, and almost anything you care to search for in an email. It can also be used to scan for text snippets within emails and to insert disclaimers into outbound emails. XamimeLT was formerly known as "Inflex".
Xamime is a commercial development spawned from Inflex, with various components released back to the OpenSource community (ripMIME, alterMIME, OpenTNEF, ripOLE, and FileType). It provides control of email filtering via spam, virus, email size, file name, file type, file contents, sender and/or receiver name, header defects, and numerous other attributes. It comes with a rapid installation process, a WWW administration interface, interface hooks to external SQL engines, spam filters, virus scanners, and custom scripts.
Mail Master is a full distributed management interface integrating sendmail, SpamAssassin, horde, and Open Anti-virus. It includes unlimited users, integrated anti-virus, user configurable spam-filter, a Web mail interface, disk quotas, custom sendmail setup, POP3, IMAP, and multi-level management (lets domain administrators and users manage their mail settings).