Feature request: Detect whether recipient has a public key

[David Srbecky]

Related to: Save signature in mail headers
> Is it possible to send the signature in mail headers?


Ok, I got other solution:
I think it is safe to assume that if user has public key than he has
compatible MUA or at least he will not mind being send signatures.

What I want is option to try import recipients public key and sign the
message only if one is found.

David