If a crypto mail has an attachment, forwarding it in Outlook does not work. A click on the forward button will just do nothing. Selecting to forward the mail as an attachment will result in an error message that the mail needs to be saved first.
The problem is that Outlook tries to write the mail, which we block to avoid a plaintext write. This then aborts the forwarding, too.
So far I have not seen a way to find out if the write comes from a forward or not.
Prio High as we at least need some kind of workaround for this Problem.