I upgrade to Nextcloud 28 and the new mailapp. After that signing mails with Smime gives problems. The message is signed with the correct key but when validating it, the signature is always invalid. The same cert works on Thunderbird and Android perfectly.
Anyone having this? I’m also missing an option to auto-sign all mails, but as long as it is broken, that doesn’t help
I don’t know the details about why the verification process fails. By default, they probably either trust the system CAs or a CA list within Nextcloud. Usually, there are a few responses to the mail app questions, if you can’t wait, check the bug tracker and the repo, if you find information.