How to gpg signed email patches?

Hi,

how do I get "git send-email" to send the patches gpg signed? I tried first signing the commit but after spending time looking into the documentation I couldn't work out how to do it. All I discovered so far is that the "git send-email" appears to be using "git format-patch" internally and that's where it currently gets lost.

Sadly none of the man pages I looked at so far mentions anything about gpg signing in this regards. Not even "git am" does.

Ideally I'd like to have "git send-email" send my patches gpg-signed to ensure authenticity and integrity.

I also considered alternatives like using my MTA to GPG-Sign these mails however as the "git am" documentation also didn't mention gpg signing I refrained from it to avoid breaking it and causing issues for anyone receiving that patch. Same for sending it using "git pack".

Is this currently a limitation or am I just doing it wrong?

Sincerely, Klaus Frank