Mike Cardwell:
> On an old Exim box, I used to do something similar to this with the following
> two line bit of config:
>
> deny condition = ${if !match{$message_body}{-----BEGIN PGP MESSAGE-----}}
> message = Unencrypted message. Encrypt then retry.
>
> Is there really no equivalent way of doing something like this in Postfix
> without having to call out to an external program?
This is what the Milter interface is for.
Wietse
