YAM (short for Yet Another Mailer) is a MIME-compliant open-source mail user agent (MUA) written for Amiga-based computer systems (AmigaOS4, AmigaOS3, MorphOS, AROS). It supports POP3, SMTP, TLSv1/SSLv3 connection security, multiple users, multiple identities , PGPv2/v5 encryption, unlimited hierarchical folders, filters, a configurable user interface based on the Magic User Interface (MUI) framework and an ARexx interface and many other features which are common for MUAs today. As the development of YAM goes back to 1995 it is one of the most feature-rich applications on the Amiga platform. Especially the MUI-based user interface allowed to implement functionality which are commonly used in graphical mail user client on other platforms today. Furthermore, the focus on support and compliance to recent RFCs is one of the key goals of YAM.