Thanks jdc. I think so too but their IT Mgr still thinks it is on our end. I'm going to paste a couple of message header infos on 2 emails and mask anything resembling an address just in hopes maybe something will help. This is a portion of a header from his email that comes over with blank message body and no attachment.

with Microsoft SMTP Server id 0.0.000.0; Mon, 1 Feb 2010 09:01:16 -0500
X-Ninja-PIM: Scanned by Ninja
X-Ninja-AttachmentFiltering: (no action)
X-MimeOLE: Produced By Microsoft Exchange V6.5
MIME-Version: 1.0
Content-Type: application/x-pkcs7-mime; name="smime.p7m,smime.p7m";
smime-type="enveloped-data,enveloped-data"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7m"
Content-Class: urn:content-classes:message
Subject: test
Date: Mon, 1 Feb 2010 09:04:56 -0500
Message-ID: <bunchalettersandnumbershere@********.com>
X-MS-Has-Attach: yes
Thread-Topic: test
thread-index: AcqjR4kNyh8XuCTZRzawTKcLQ8lfmQ==


And here is another from someone that I received the encrypted file correctly.
with Microsoft SMTP Server id 0.0.000.0; Tue, 30 Jun 2009
13:32:12 -0400
Content-Class: urn:content-classes:message
Subject: RE: 401K 7-2-09.xls
MIME-Version: 1.0
Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data;
name="smime.p7m"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7m"
Date: Tue, 30 Jun 2009 13:33:48 -0400
Message-ID: <bunchalettersandnumbers@***********.local>
X-MimeOLE: Produced By Microsoft Exchange V6.5
In-Reply-To: <bunchalettersandnumbershere@exchange>
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Thread-Topic: 401K 7-2-09.xls
thread-index: Acn5qFM6eNtlO6FxSN2gaPcWQt/gEgAAI9oA
References: <bunchalettersandnumbershere@exchange>