[Enigmail] Enigmail fails to detect encrypted message

[Patrick Brunschwig]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Lachezar Dobrev wrote:
>   After a few of my colleagues upgraded Enigmail to 0.95.6 I noticed,
> that messages from them are no longer detected as encrypted, and instead
> are displayed as plain-text with OBVIOUSLY encrypted contents.
> 
>   I also upgraded to 0.95.6, but the behavior remains the same.
> 
>   Here is an obfuscated excerpt from a message that fails to decrypt
> 
> 
>> From: Obfuscated Colleague < colleague at company.com
> <mailto:colleague at company.com>>
>> Organization: Company COM
>> User-Agent: Thunderbird 2.0.0.9 <http://2.0.0.9> (Windows/20071031)
>> MIME-Version: 1.0
>> To: My Humble Self < myself at company.com <mailto:myself at company.com>>
>> Subject: Obfuscated subject
>> X-Enigmail-Version: 0.95.6
>> Content-Type: text/plain; charset=windows-1251; format=flowed
>> Content-Transfer-Encoding: 8bit
>>
>> -----BEGIN PGP MESSAGE-----
>> Charset: windows-1251
>> Version: GnuPG v1.4.4 (MingW32)
>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>>
>> <encrypted contents here>
>> -----END PGP MESSAGE-----
> 
>   I think the problem is the Content Type, but I am no specialist.
>   I found out, that this behavior is not seen when:
>    1. The message has any attachments (including, but not limited to a
> vCard)
>    2. The account uses the 'Always use PGP/MIME' option.
> 
>   If I turn on the 'Display expert settings' the OpenPGP menu shows a
> 'Decrypt/Verify' menu item, that can be used to manually decrypt the

That's the same as clicking on the "OpenPGP" button in the toolbar.

> message. At that point Enigmail SUCCESSFULLY decrypts the message, but
> shows an error message 'Error - No valid armored OpenPGP data block found'.

Did you accidentially disable the option "Automatically decrypt/verify
messages" in the OpenPGP menu (only visible if the 'Display expert
settings' option is on). Otherwise, do you maybe view your messages as
HTML instead of plain text (View > Message Body As > Plain Text). If
both don't help, then I would need to know the _complete_ message source
to do further analysis, you can send it directly to me.

- -Patrick
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.8 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iQEVAwUBR4VF0XcOpHodsOiwAQJbAAf/a2MzKqcsI3qLbKILtc6h2FXVOGZ2WXNu
dG3imYY9U7bSfpsU06xzn1dFANog8ssTf2PVkbm9Z/VsKRanMPWoUA1+A3UWwzKR
Jh8xUsbfVal483Ekg5a7w88loo6JubvyrrMOCe8m8LKlgvjM0TlI7JJXe1CbOrpt
pfhZxmBAU1NUTVAAZpqlBFqzSu4gElIE5Ht/lmKD8avEg1VEJ1gzQJWk+U5iaaBS
F70VPvOJVNBxqIVkUyUPIJIHJhiWyjxDK0KLr5K36jI7bKRqhWAkhNe30Jf8elID
lmfPlsTz1KO2Zm1wBJDo9fyaZ/USs8C2mwhCB+FBUQ06Efm/P14T8g==
=FZNj
-----END PGP SIGNATURE-----