On 2010-06-22 06:24 PDT, Logan Jones wrote:
> Whenever someone receives an email with a .p7m extension as an 
> attachment, Thunderbird eats it.

I suppose you mean /attachment/ rather than /extension/.

> Normally it would be saved to the desktop and decrypted with the
> standalone entrust application, but we can't even get that far.

I would say that normally Thunderbird would just process the p7m itself.
It's quite capable of doing so.  It does so for me many times every day.
It handles p7m's generated by many other email clients, including outlook,
Entourage (Outlook for Mac), and others.

So the question on my mind is: what's different about these messages you're
getting that causes them not to be recognized and handled in the normal
fashion?

My guess is that it's a problem with MIME headers such as Content-Type,
or disposition.  The only way to be sure is to look at the actual source
of a message.  Maybe you can make an example message that contains no
sensitive content for that purpose.
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