Whenever someone receives an email with a .p7m extension as an
attachment, Thunderbird eats it. Normally it would be saved to the
desktop and decrypted with the standalone entrust application, but we
can't even get that far. If I view the message source, I can see that
it's supposed to be there, but it is not retreivable. I've seen a few
people ask the same question on the forum (dating back to v 1.5) with
no satisfactory answer. There is a bug report at
https://bugzilla.mozilla.org/show_bug.cgi?id=243833 that was filed in
2004. In the comments for that bug report there is an addon called
'Smart P7m Support,' but that route isn't viable as it's not on the
official Mozilla addon site. Even if I felt like combing through the
code to make sure there's nothing malicious about it (I don't doubt
that it's legit; unfortunately, we work with a lot of sensitive data
so anything like this has to have a good measure of certainty behind
it,) I can't be certain that it wouldn't introduce any new
vulnerabilities. What I'd really like is a short and sweet way to make
Thunderbird handle .p7m extensions like it does every other extension.
Otherwise, it looks like I'm going to have to spend a week migrating
our office to Outlook.
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