1. Tagged Message Delivery Agent TMDA is an OSI certified software application designed to significantly reduce (or eliminate) the amount of SPAM/UCE (junk-mail) you receive by using unique, cryptographically enhanced (tagged) e-mail addresses. TMDA can both filter your incoming e-mail, and tag your outgoing address. TMDA was originally based upon a Perl script written by Thomas Erskine called Tagged Message Sender (TMS), but has since evolved into a significantly larger and more featureful application. From Debian 3.0r0 APT