We realize that there is a quite well hidden contrib to NAV out there that is worthy a better advertisement. Mailin is implemented by Andreas Solberg at UNINETT;
MailIn is a subsystem of NAV, which receives an e-mail at stdin, find an appropriate parser for the current mail, and post an event to the NAV system. The parsers are created using a plugin architecture. Each parser is a class placed in the plugins/ folder, and inherits from EventSystem.
Read more on: http://drift.uninett.no/~andreas/mailin/
We will link to this page from metanav soon...