[Enigmail] Enigmail fails to detect encrypted message

[Lachezar Dobrev]

  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>
> Organization: Company COM
> User-Agent: Thunderbird 2.0.0.9 (Windows/20071031)
> MIME-Version: 1.0
> To: My Humble Self <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
message. At that point Enigmail SUCCESSFULLY decrypts the message, but shows
an error message 'Error - No valid armored OpenPGP data block found'.
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