I have started signing my mail with PGP, and it attaches the file
signature.asc to my messages to verify that I sent them with content, as you'd expect, like this:
-----BEGIN PGP SIGNATURE----- iQIcBAEBCAAGBQJUHRK/AAoJEMJWYKCGVRRfo+8QAJ+of0o30gPA3+OAWK/03JZN STWaF+DQIsxFX6vuLgl10b8D1SyH78vMfMBy785+P/Do/hAzk2g+cBNz0q4oUi7/ cCAI7w3s6EJ5CUCPr3iaP3C9DpMnpj5i0wEZ+ZsGGQ0xiiTTKGPyvQp0KteDvX1l v7+ljufmFAm2KGir80AjwLyU9HypYr9K9hz6KBwkgm9dk0ocLhB6cSR+lDjDMUBH Sfdpgim8Yt1NqBBA/HidKcEuGPWsdN2A9Kr0/8pu0qhwHIvQPRVG+51jM5gUN1yr /+NBALvNWPL0dh61Z0gHe0APu0C+bKx941RRzCi1e4kb/NCVkijX1rcgUzguY4H3 h3tFK30UK1/mtMW5SLV/AwE0XVi/qmXc6i0Tvvd6fpRmfT8rlnJyyiEC7GNHWS7F yTCNUaqRrcPwGTnEPSUm2n/y3Yst0lo0k4NVvv3/M+eauFqu6WmMrefMBWQU03DQ EITaOTakmwDFBlxa9VyP5/s7OftgMKcSIgxXROclIWNiid2eu843JhGshH3HrCe2 SakzKKyR/17ISdIsuDOpzRhfa0ghXWfXg+ksqSqx5FYaOOJlBOWXSVJu4sbDORGr aeY6c+5tzyUxkNHkrIOzOXfJDh/86TughlYmi71WqonDndm0N5n1o0WZL569xkwg kwi1/SZI1k27sk/e3yku =Xyfk -----END PGP SIGNATURE-----
Is it possible to include a "comment" with the signature file? If someone uses PGP/GPG they will just see a message that the email was signed. But most people I send mail to do not use PGP, so they will see this attachment and perhaps will be confused - is it possible to include a "comment" in this file (ideally auto-generated) which explains that what the signature means to the uninitiated?