submit is a daemon-less mail transfer agent for multi-user Unix systems, implemented in Python. In contrast to other MTAs, it moves the configuration of non-local mail delivery away from system administrators and towards the individual users. Notable features are:

A user’s manual is available.

submit is distributed freely under the terms of the MIT/X license.

The latest release is 0.2; you can grab a source tarball, a Debian source package or a Debian binary package built for Sid on May 10, 2012.