YAM (short for Yet Another Mailer) is a commonly used MIME-compliant Internet mailer written for AmigaOS computers. It supports POP3, SMTP, TLSv1/SSLv3, multiple users, PGP, hierarchical folders, filters, a configurable GUI, an ARexx interface and more...
Simple BSmtp (Batch-Smtp) file processor with built-in MajorDomo, which can be used stand alone or as filter inside of an Smtp server (here e.g. in Weasel).