[Enigmail] Failure to recognize signature of Signed+Encrypted mail from KMail.

[Patrick Brunschwig]

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Lachezar Dobrev wrote:
>   Recently a colleague migrated to KDE, and started using KMail as his
> mail application.
>   After a few messages I noticed, that the messages that my colleague
> was signing were OK, those that were encrypted also worked fine.
>   However messages that were both encrypted and signed were correctly
> decrypted, but their signature was not detected and was visible as an
> attached file in the decrypted message called signature.asc.

That's right (but of course not correct). The problem lies deep inside
Thunderbird, and I could not yet find a way to fix it. Therefore
currently any RFC 3156 messages following section 6.1 (i.e. sign and
encrypt in 2 steps) are decrypted any only for valid signatures if the
message size is very small.

- -Patrick
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