I have a strange problem trying to decrypt a message from a friend of
mine who composes his messages with Apple Mail/GPGMail. I can see his
message within my Inbox, it has two attachments ("PGPMIME Versions
Identification" and "encrypted.asc"). But my Thunderbird 24.5.0/Enigmail
1.6 is not able to decrypt the message and verify the signature?! On the
command line I can decrypt/verify the message. Also I can decrypt/verify
with my own Apple Mail Client. Thus I think this is a bug within
Enigmail... Is there a way to fix this? Here is a major part of the
source of a test message:
The message looks like, but is not a PGP/MIME message. The content type for PGP/MIME messages is defined to be "multipart/encrypted; protocol='application/pgp-encrypted'". The content-type of the message you provided is "multipart/mixed". That's a standard content-type handled by Thunderbird, Enigmail cannot access it, even if I wanted to.
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Hello!
I have a strange problem trying to decrypt a message from a friend of
mine who composes his messages with Apple Mail/GPGMail. I can see his
message within my Inbox, it has two attachments ("PGPMIME Versions
Identification" and "encrypted.asc"). But my Thunderbird 24.5.0/Enigmail
1.6 is not able to decrypt the message and verify the signature?! On the
command line I can decrypt/verify the message. Also I can decrypt/verify
with my own Apple Mail Client. Thus I think this is a bug within
Enigmail... Is there a way to fix this? Here is a major part of the
source of a test message:
From: ...
To: ...
Subject: PGPGPG-Test
Thread-Topic: PGPGPG-Test
Thread-Index: AQHPXlTWkeeBC78ZtEu5bRsRqjo1fw==
Date: Tue, 22 Apr 2014 18:01:20 +0000
Message-ID: 487CA420-773A-4EA6-A828-512F06973E24@...
Accept-Language: de-DE, en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [109.104.39.235]
Content-Type: multipart/mixed;
boundary="003_487CA420773A4EA6A828512F06973E24dirkzimmermannde"
MIME-Version: 1.0
--003_487CA420773A4EA6A828512F06973E24dirkzimmermannde
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
--003_487CA420773A4EA6A828512F06973E24dirkzimmermannde
Content-Type: application/pgp-encrypted;
name="PGPMIME Versions Identification"
Content-Description: PGP/MIME Versions Identification
Content-Disposition: attachment; filename="PGPMIME Versions Identification";
size=13; creation-date="Tue, 22 Apr 2014 18:01:20 GMT";
modification-date="Tue, 22 Apr 2014 18:01:20 GMT"
Content-ID: 77C154A3D62837418C06A679AF42A190@united-hoster.local
Content-Transfer-Encoding: base64
VmVyc2lvbjogMQ0NCg==
--003_487CA420773A4EA6A828512F06973E24dirkzimmermannde
Content-Type: application/octet-stream; name="encrypted.asc"
Content-Description: OpenPGP encrypted message.asc
Content-Disposition: attachment; filename="encrypted.asc"; size=1919;
creation-date="Tue, 22 Apr 2014 18:01:20 GMT";
modification-date="Tue, 22 Apr 2014 18:01:20 GMT"
Content-ID: B67E2A1A88FD434E9314F2AA7D471C42@united-hoster.local
Content-Transfer-Encoding: base64
LS0tLS1CRUdJTiBQR1AgTUVTU0FHRS0tLS0tDQpDb21tZW50OiBHUEdUb29scyAtIGh0dHBzOi8v
...
--003_487CA420773A4EA6A828512F06973E24dirkzimmermannde--
Thanks a lot!
Regards,
Thorsten
The message looks like, but is not a PGP/MIME message. The content type for PGP/MIME messages is defined to be "multipart/encrypted; protocol='application/pgp-encrypted'". The content-type of the message you provided is "multipart/mixed". That's a standard content-type handled by Thunderbird, Enigmail cannot access it, even if I wanted to.
Thanks a lot for your answer! I'll investigate that and report again!!
Is it possible, that MS Exchange Mail Server alters a message that way?
Yes, there are some versions of Exchange that are known to do this.