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)