Reject non-PGP mail (was: Re: Who bought off Zimmermann?)

[Moritz]

On 26.08.2013 06:12, Bill Stewart wrote:
> You might be able to run an email service that scans inbound email for an
>         X-PGP-Encrypted: header, and if it sees "From:" or "Subject:"
> first,
> bounces the email with a 503 or 550: "Sorry, Encrypted Email Only, Get
> PGP at www.pgp.com",

If you're crazy enough to do so, here's a mail filter that rejects
non-PGP mail. Currently, it simply scans the first 5000 characters for
"-----BEGIN PGP MESSAGE-----", and, if not there, rejects with a 550.

https://github.com/moba/pgpmilter

We will use it soon for the onion.to Tor mail gateway:

https://lists.torproject.org/pipermail/tor-talk/2013-August/029464.html

--Mo