Bug 409456 - KMail can not deal with PGP messages sent by Exchange
Summary: KMail can not deal with PGP messages sent by Exchange
Status: REPORTED
Alias: None
Product: kmail2
Classification: Applications
Component: general (show other bugs)
Version: 5.11.2
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: kdepim bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-07-03 12:50 UTC by Fabian Vogt
Modified: 2021-01-09 18:21 UTC (History)
1 user (show)

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Description Fabian Vogt 2019-07-03 12:50:33 UTC 
Exchange (in this case Office 356) mangles PGP encrypted messages when sending.

Content-Type: multipart/encrypted; boundary="nextPart6734939.BlDrd8uHN9"; protocol="application/pgp-encrypted"

ends up as

Content-Type: multipart/mixed;
	boundary="_003_2390612FqyDRV8H2nlinuxe202susede_"

And so KMail is unable to show the mail correctly. By editing the content-type to say multipart/encrypted, it's displayed correctly.

See also https://gitlab.com/enigmail/enigmail/blob/master/package/fixExchangeMsg.jsm#L224 how enigmail deals with this.
Comment 1 Ellen Papsch 2021-01-09 18:21:06 UTC 
Some more information:

Messages are not garbled if only signed.

GNOME Evolution also had the discussion regarding a workaround some time ago: http://gnome-evolution-general.1774414.n4.nabble.com/Evolution-3-18-5-2-Encryption-with-GPG-from-Hotmail-Account-message-structure-td4665706.html

I also got Office 365 SMTP working. Their SMTP server does not have the problem.