This is a port of tmdatools plugin for Squirrelmail.

This plugin allows a TMDA enabled account to be managed from within the
SquirrelMail interface, including the ability to edit list files, add
control headers to outgoing email, manage pending messages and create
tagged addresses for use outside SquirrelMail.

WWW: http://www.morison.net/squirrelmail-plugins/tmdatools.html