The GnuPG and SMIME support in evolution only supports the SHA-1 hash signature, which makes it impossible to use stronger keys based on e.g. SHA-2. See the upsteam bug report for more details. I have backported the upstream patches to evolution 2.28 and evolution 2.30. I'm currently testing these in my own overlay graaff. I'll attach the evolution 2.30 patches here as well.
Created attachment 236033 [details, diff] evolution-data-server patch
Created attachment 236035 [details, diff] evolution patch
Looks better to wait for 2.32 since that patches break API: https://bugzilla.gnome.org/show_bug.cgi?id=304415#c76
Closing then, we will wait for 2.32
(In reply to comment #4) > Closing then, we will wait for 2.32 > Makes sense for the official tree, but I'll keep patches ebuilds for 2.28 and 2.30 in my overlay for those who need the stronger keys.
Great to know, I will point people there is anyone contact us looking for the same :-)
*** Bug 334553 has been marked as a duplicate of this bug. ***
evolution-2.32 is now in tree.
Closing fixed, thanks for reporting.