Michael Ströder wrote:
Against which component?

Product: MailNews Core
Component: Security: S/MIME

A smart thing to do would be to test also Trustedbird http://www.trustedbird.org and open a bug on their bug system if it fails.

They are much more likely to fix this than anyone else. And port the patch to Thunderbird/Seamonkey.

Is it rather a matter of Seamonkey using an old
libnss without SHA-256 support?

It's not. It's more a matter of MailNews's S/MIME module fully ignoring anything that is less than 6 or 7 years old. And having an hard coded list of the algorythm it expects in S/MIME even when receiving mail.
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