mailfilter (my new mailreader for nmh) got a fairly important upgrade today. I added in both screen support and better pgp handling.
Screen is supported if you want to use it, see SCREEN_POLICY in the script.
Mail starting with -----BEGIN PGP SIGNED MESSAGE----- will now be sent through pgp_verify_command much in the same way that multipart/signed (pgp signature attachment) mail is.

So that was how I spent 4 hours this morning (among other projects...)