Handle email encryption [smime.p7m]

[pevsonic]

Thunderbird : 68.4.1
Lookout : 2.0.2
O/S : Linux
Distribution : Debian 10.2 (64 bit)

I have a situation where I'm receiving an email from Outlook users to my Thunderbird on Linux where if they're sending either :

1. unencrypted message with a certificate attached
2. encrypted message (that I have a certificate for already)

For case (1) I see attachments ""body_part_0.rff" and "smime.p7m". The body_part_0.rtf contents appear to render as a message correctly but the p7m I would expect to be handled by Thunderbird - I would typically be detected as a vaild digital signature and import it IIRC.

For case (2) there is no message I just see the attachment "smime.p7m" and thunderbird doesn't attempt to decrypt which it does for the same user if not sent as TNEF.

Happy to help & test but unfamiliar with Thunderbird internals!

[dugite-code]

Unfortunately lookout runs after the message is opened and all of Thunderbird's attachment parsing is finished. This is also why we as of yet do not have full lightning calendar integration.

I am unsure how I would be able to integrate this sanely, especially with the move to web extensions. For the future there was mention in the mailing list that they will Investigate adding Microsoft TNEF support.