I use Gpg4Win 2.3.3 and GpgOL in Outlook 2013 (32bit). When I write a mail and Sign it with my private key, a -----BEGIN PGP MESSAGE----- block is appended to the bottom of my mail.
I can then remove my text, only keeping the PGP MESSAGE section, send it to myself, open Outlook on another computer, open the mail, click Verify and the original message appears.
Is this by design? Because when signing a text in GPA a PGP SIGNATURE is appended, which seems more normal.
(Btw, clicking Decrypt instead of Verify gives me “Decryption failed: No data.” with Unknown error in the details)
I just noticed the 3.0.0 beta page and downloaded the latest one, and signing seems to work as expected now.
The Signing takes place when I click Send (as opposed to the Sign-button in 2.3.3), and the resulting mail has a noname.sig attachment with a PGP SIGNATURE, and it’s automatically verified correctly when opening.