help with encrypted attachments

[MishNY]

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>

[jdc2000]

I don't see anything n the headers that would be useful in tracking down the cause. It might help if you provided some details on exactly how or what method of encryption you are using on these e-mails. It sounds like you are using some of secure encrypted e-mail rather than just encrypting the attachments.