upgpverify software verifies PGP signed/encrypted message on stdin in 50 words.
One of the standout features of upgpverify is its ability to handle both MIME and non-MIME (traditional PGP format) messages. Plus, it can handle base64 and quoted-printable encoding. Another bonus is that upgpverify sets several environment variables that contain various headers of the incoming email.
Supported PGP / GPG versions include GPG 1.0.4 (earlier versions may work but haven't been tested), PGP 2.6.x (tested with 2.6.3is), and PGP 5.0i (tested with some 5.0i1b version).
In the latest release, upgpverify has added a --max-len option to restrict the size of incoming messages. Overall, if you need a reliable PGP verification tool that is easy to use and works seamlessly with qmail, upgpverify is definitely worth considering.
Version 0.3.8: N/A