gpg - sign only & import encypted mails ?

[ka7]

I don't need encryption, but signing ( via pgp ) the mail would be beneficial.
( not secret, but authentic sender )

and/or: if the incoming emails are pgp-encrypted, to be processed.
some servers are outside and provide status (updates needed) via email to redmine.
having that encrypted might be cool.

[timegrid]

@ sign only
What would be the usecase exactly? If users (including bots) are capable of signing/validating mails, they are also capable of en-/decrypting them. The only difference I see is that users don't need to provide the passphrase for received mails (although passhrase is needed to send signed mails). I don't see, why you should drop encryption, even if not needed explicitly.

@ import encrypted mails
If those status mails would be an encrypted mail response to a ticket, and are piped into the rdm_mailhandler, it should work fine right now. Probably I don't get your point, could you elaborate?