Emails sent to me from outlook.com show encrypted content as two separate files: PGPMIME version identification and encrypted.asc. The email content itself does not show (or at least I don't know how to make it visible). This works fine in Evolution (tested 3.26 and 3.28) and so far from Gmail accounts.
I'm also hitting this bug when sending email using an outlook.com account, the message is split into two attachments, I have read a bit on it and it seems that Exchange makes any text before an attachment another attachment (see http://kb.mit.edu/confluence/pages/viewpage.action?pageId=4981187) making the Version: 1 text of the encrypted message the first attachment (ATT00001), resulting in this error: org.kde.pim.mimetreeparser: Unknown PGP Version String: "-----BEGIN PGP MESSAGE----- .... This is very similar to 212952 reported quite a while ago. I can share an email that has this issue if its necessary. KMail Version 5.12.1 (19.08.1) KDE Frameworks 5.62.0 Qt 5.13.1 (built against 5.13.1)
I can confirm that this is still an issue with the latest openSUSE Leap 15.2, kmail 5.14.2. I wouldn't mind looking into this for my own benefit, but I'm not sure which subsystem to start with. Has anyone looked into this sufficently to know where to start mofifying the PGP attachement parsing? Operating System: openSUSE Leap 15.2 KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.71.0 Qt Version: 5.12.7 Kernel Version: 5.9.8-3.gea93937-default OS Type: 64-bit Processors: 8 × Intel® Core™ i7-8665U CPU @ 1.90GHz Memory: 31.2 GiB of RAM