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Some users unable to recieve email attachments from some senders

Posted on 2011-03-17
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Last Modified: 2012-05-11
I have several users that are having issues receiving emails with attachments from some senders.  For instance, one of my users said that someone tried to email him a PDF attachment & received the following undeliverable message:

mail.mydomain.com #554 5.7.1 Message cannot be accepted, content filter rejection "Receiving server does not accept this attachment type" ##

Then, we received a call from another client that said they were getting undeliverable messages when trying to send him .doc files.  (they didn't provide the error)

The funny thing is I tried emailing him from my gmail account & he was able to receive both PDFs & DOC files from me.

Additionally, I had another user with a similar problem.  Someone tried to send her a PDF...no luck.  But if they sent it to someone else in our domain...no problem.

We're using Outlook 2003, Exchange 2003, SonicWALL NSA 2400 & IceWarp (for spam filtering).

Thanks in advanced for the feedback!
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Question by:blugirl
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by:cavp76
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What does IceWarp logs say about those rejections?
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by:blugirl
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@cavp76:

Icewarp log:

199.253.16.5    [09C8] 12:05:03 Start of mail processing
199.253.16.5    [09C8] 12:05:03 Message for <user@mydomain.com> not delivered. Reasons:[ContentFilter="Receiving server does not accept this attachment type",Bypass=S], Action:REJECT
199.253.16.5    [09C8] 12:05:03 *** <sender@sendersdomain.com> <user@mydomain.com> 2 591364 00:00:03 CONTENT-FILTER ZWU75559
199.253.16.5    [09C8] 12:05:03 >>> 554 5.7.1 Message cannot be accepted, content filter rejection "Receiving server does not accept this attachment type"
199.253.16.5    [09C8] 12:05:03 <<< QUIT
199.253.16.5    [09C8] 12:05:03 >>> 221 2.0.0 mail.mydomain.com closing connection
199.253.16.5    [09C8] 12:05:03 Disconnected
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cavp76 earned 500 total points
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Then there's something wrong with that filter.... try disabling it for a while and test again; also check if the mail server of the sender is not in any RBL... http://www.robtex.com/ is a good place to test this.

HTH
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by:blugirl
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You mean in IceWarp?  But I haven't changed anything? :(
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by:cavp76
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As I said, disable it for a while, and check also the RBL status... if nothing was changed, perhaps it's not your problem, but theirs
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by:blugirl
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@cavp76:

Since we have some users that get flooded with spam, I'd really hate to turn IceWarp off globally.  So I tried adding their domain to the bypass list under "use DNSBL (DNS blackhole list), but the same thing happened.  Sorry...I'm not that savvy when it comes to IceWarp.  We had a consultant set it up for us & I was shown the basics.

It doesn't appear that either of the 2 domains that we're having problems receiving from is blacklisted.  Also, we're able to receive emails from them without attachments...but just not if they try to send PDFs.  My understanding was that if it was a blacklist issue, that we wouldn't be able to receive any emails from them...is that not the case?  I guess I'm getting thrown off by the reference to the rejected file type.

I can try disabling IceWarp all together on Monday.

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by:cavp76
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I don't know either IceWarp appliance... one thing that could be happening is those PDFs are coming infected with any of those latest vulnerabilities, and if the IceWarp appl. has an integrated AV engine, it is filtering them... other than that I run out of ideas
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by:blugirl
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@cavp76:

Thanks again for your help!  I did a bit more research this morning & found that there was an IceWarp Content Filter labeled "Receiving server does not accept this attachment type".  Although PDFs weren't listed, I disabled this filter, retested & it worked just fine.  Since our SonicWall also filters specified attachments types, I'll just use that to specify this instead.
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Author Closing Comment

by:blugirl
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I was able to locate the specific content filter to resolve this issue in IceWarp.
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