The missing signature was a problem on my end. The customer mail (to ted / exchange server) works fine if the cert is in the keyring. The testmails (via outlook imap) are fine, too. I still need a better test setup for mails to our exchange accounts, but this is enough to rule out a problem in gpgol. I adjust my former message accordingly.

Hmm ich sehe weiterhin die Signatur.

The missing signature indication can also be seen now in the customer mails sent via kmail (ted:INBOX, e.g. 18.02. 12:52). This was fine before.

The basic fix for the msg box looks good to me on gpg4win-5.0.2 (beta) @ win11.
There's only no signature shown anymore, not even for the formerly working case 1.
Note: I also tested those mails sent to an exchange server with the same result as via IMAP.

Note for mails with 2 attachments, where the warning is displayed: Those mails can't be moved

Regarding 8. encrypted/signed vcard attachment:

Notes:

• "Save encrypted" is only "Save" in the UI.
• This is still reproducible in gpg4win-5.0.0-beta476 @ win11

I can't reproduce your problems. Can you get me the exact test files you used?

Resolved without further testing, all further improvements in new tickets

Tested on gpg4win-5.0.0-beta413 @ win11.

(removed unfinished text)

Done with https://invent.kde.org/pim/mimetreeparser/-/commit/0624268ae545ced59177ce15f92be119ba43025a

Concluded after talking with Carl that there is no need to backport this any more. Therefore retagging this for gpd5x

This should now work on master, I will write here once this is in the next beta

Carl found some issue with this himself.

Now the message box for KMail, MimeTreeParser and Kleopatra are all using the same code in Libkleo.