Please describe the problem:
I set up my .gnupg/options file to have this entry

digest-algo SHA256

and after that signatures produced by mutt are created using SHA256.  But signatures created by evolution still use SHA1.

Steps to reproduce:
1. Compose and send a signed message
2. Check the signature on that message
3. Notice that it is an SHA1 signature


Actual results:
My message is signed with an SHA1 signature

Expected results:
My message being signed with an SHA256 signature

Does this happen every time?
Yes

Other information:
SHA1 is broken and I want to stop using it.  I don't care if recipients won't be able to check my signature.  I want them to check a signature that's secure with reasonably modern software, not a signature that's potentially fake because it uses a broken algorithm.