#554 rejecting banned file attachment ## message

We have a couple of end users trying to send CAD drawings that are 5 MB and under and they are getting a #554 rejecting banned file attachment ## error message from our Exchange 2010 server. They are using Outlook 2010.

They have been able to send other attachments such as PDFs but this has happened for two different recipients.

We have checked with MXTOOLBOX and we are not on any BlackLists that I can see. There are not any error messages on the server and other email seems fine. I have included an example header email below. Any assistance offered would be appreciated:

Generating server: Hermes.dwma.com
MARIONY.AURELE@SECOENERGY.COM
relay.secoenergy.com #554 rejecting banned file attachment ##
Original message headers:
Received: from Hermes.dwma.com ([fe80::d137:ef4f:20bc:b8a0]) by
 Hermes.dwma.com ([fe80::d137:ef4f:20bc:b8a0%10]) with mapi id 14.02.0318.001;
 Tue, 10 Nov 2015 09:22:11 -0500
From: "Rita L. Klein" <rklein@dwma.com>
To: "MARIONY.AURELE@SECOENERGY.COM" <MARIONY.AURELE@SECOENERGY.COM>
Subject: FW: Greater Lakes Phase 3
Thread-Topic: Greater Lakes Phase 3
Thread-Index: AdEbwsZ2+Tnt3shKShSb/sC2Ny4KqwAADjpw
Date: Tue, 10 Nov 2015 14:22:08 +0000
Message-ID: <77FE69C8F789F84C94363DA1185B069811AD8C@Hermes.dwma.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [192.168.1.172]
x-tm-as-product-ver: SMEX-10.2.0.1135-8.000.1202-21932.007
x-tm-as-result: No--63.555800-5.000000-31
x-tm-as-user-approved-sender: No
x-tm-as-user-blocked-sender: No
Content-Type: multipart/mixed;
        boundary="_004_77FE69C8F789F84C94363DA1185B069811AD8CHermesdwmacom_"
MIME-Version: 1.0
regsampAsked:
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William FulksSystems Analyst & WebmasterCommented:
Have you had them check their servers? They might be blocking that file extension for some reason.

This probably won't work - but you could try zipping the file first and then sending the zip. Is there another format you could save it in?
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regsampAuthor Commented:
It looks like the files were zipped and the company was blocking zipped files.  I had the user send the dwg file and they got it. I am checking the other example now.
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William FulksSystems Analyst & WebmasterCommented:
Weird that they would block zip files since they are so common, but they must've had some issue previously.
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regsampAuthor Commented:
Right. I thought so as well.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Some systems inspect zipped files and if a file with a blocked extension is found then the zip file is also blocked.
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regsampAuthor Commented:
Right Mohammed. We were just not expecting it because we have sent these files before but they must have changed their settings.
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