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Date: Tue, 10 Jun 2008 15:34:59 -0500
From: Paul Schmehl <pschmehl_lists@tx.rr.com>
To: Andrew Berry <andrewberry@sentex.net>, freebsd-questions@freebsd.org
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--On Tuesday, June 10, 2008 16:23:32 -0400 Andrew Berry 
<andrewberry@sentex.net> wrote:

> On 10-Jun-08, at 1:07 PM, Paul Schmehl wrote:
>
>> Andrew, maybe you could send a signed message, state in the body
>> that it was signed, and then I can look at the headers and tell you
>> what's going on.
>
> Here is a message which has been signed.
>

There's no sig attached, so it's getting stripped off somewhere.
This line in the headers looks to be the culprit:
X-Content-Filtered-By: Mailman/MimeDel 2.1.5

That will strip all attachments, including S/MIME.

-- 
Paul Schmehl
As if it wasn't already obvious,
my opinions are my own and not
those of my employer.