[kmail2] [Bug 360910] New: KMail shows PGP/MIME encrypted content as attachment, does not offer to decrypt.

[quazgar via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=360910

            Bug ID: 360910
           Summary: KMail shows PGP/MIME encrypted content as attachment,
                    does not offer to decrypt.
           Product: kmail2
           Version: 4.14.10
          Platform: Debian testing
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: crypto
          Assignee: kdepim-bugs at kde.org
          Reporter: quazgar at posteo.de

I am not certain if this is a regression to bug 286481 again, the symptom looks
very similar to me.

When receiving PGP/MIME encrypted mails from Apple Mail with GPGMail (in most
cases, this means mails with attachments), KMail shows the MIME parts as
attachments instead of asking to decrypt them.

The relevant message parts looks like this:

...
Content-Type: multipart/mixed;
        boundary="_003_55514CDCA78D430384C5F0810DF10C7Adsmpgde_"
MIME-Version: 1.0
X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4


--_003_55514CDCA78D430384C5F0810DF10C7Adsmpgde_
Content-Type: text/plain; charset="us-ascii"


--_003_55514CDCA78D430384C5F0810DF10C7Adsmpgde_
Content-Type: application/pgp-encrypted;
        name="PGPMIME Versions Identification"
Content-Description: PGP/MIME Versions Identification
Content-Disposition: attachment; filename="PGPMIME Versions Identification";
        size=77; creation-date="Tue, 22 Mar 2016 16:09:18 GMT";
        modification-date="Tue, 22 Mar 2016 16:09:18 GMT"
Content-ID: <D82BB3DF89947646AD6C4C24C8C54BAC at um.gwdg.de>
Content-Transfer-Encoding: base64

VmVyc2lvbjogMQ0NCg==

--_003_55514CDCA78D430384C5F0810DF10C7Adsmpgde_
Content-Type: application/octet-stream; name="encrypted.asc"
Content-Description: OpenPGP encrypted message.asc
Content-Disposition: attachment; filename="encrypted.asc"; size=3183;
        creation-date="Tue, 22 Mar 2016 16:09:18 GMT";
        modification-date="Tue, 22 Mar 2016 16:09:18 GMT"
Content-ID: <58A712E65AB1824AB726904A6449178F at um.gwdg.de>
Content-Transfer-Encoding: base64

LS0tLS1CRUdJTiBQR1AgTUVTU0FHRS0tLS0tDQpDb21tZW50OiBHUEdUb29scyAtIGh0dHBzOi8v
Z3BndG9vbHMub3JnDQoNCmhRSU1BK1Yrc2NWMjZLanRBUS8vVFUvamtkMG0zVzRDRDJmdjd4NGJu
...
RjdnPT0NCj0yRUlaDQotLS0tLUVORCBQR1AgTUVTU0FHRS0tLS0tDQo=

--_003_55514CDCA78D430384C5F0810DF10C7Adsmpgde_--

The full message is available as well, if necessary.

Reproducible: Always

Steps to Reproduce:
Get PGP/MIME encrypted message from Apple Mail.

Actual Results:  
Does not decrypt message.

Expected Results:  
Should decrypt message.

If the file "encrypted.asc" is saved to disc and decrypted manually, it can be
opened by KMail as a separate message.

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