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Attachments Corrupted over a certain size from one organization

We are having a problem receiving attachments from one organization when the attachments have a combined total of > 100kb. Our default setting on Exchange is to allow all attachments (non .exe and .vbs) that are < 5mb. Problem comes only from this one organization, as files of similar sizes are allowed when sending from other .org(s), Gmail, or AOL email addresses.

Attachments are generally .pdf, .xls, or .doc. The emails are coming through (not bouncing), however any attachment over the 100kb threshold becomes corrupted. The tech support from that org says that they don't have a problem with any other groups. I have also had that organization send emails to my Gmail account, which also become corrupted. They insist that the attachments themselves are not corrupted, and that they have tested these attachments beforehand.  

Our Exchange Server is Win2003 (SP2), Exchange 2003, AVG AV 8.0 Network, and is behind a SonicWall firewall. All of the latest Windows Updates are installed, other than .net framework 3.5.

Any ideas?
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caitech
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caitech
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1 Solution
 
Stephen CroftTechnical ArchitectCommented:
Just to clarify;

Company A send You attachments over 100kb, corrupt.
Company A send Gmail attachments over 100kb, corrupt.

Company A say it is not their fault?

Well it's certainly not your Exchange box, and you proved that with your Gmail configuration. Try a couple of other accounts (hotmail etc) and kick it back to them.
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caitechAuthor Commented:
The problem may also have something to do with VBA Macros being disallowed through our firewall. But generally any email sent containing a file with VBA Macros will bounce with the message:

552 552 MS-Office file containing VBA macros found inside of the email (state 18)

Thoughts?
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SurajCommented:
You have problems receiving emails more than 100 kb from one domain. but you get the same attachment whn being send by gmail, aol... Is that right ?
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SurajCommented:

If your exchage server is able to receive emails with attachment more than 100 kb from other domains... that proves that exchange server do not have any issues accepting the mails of those size... so its issue with remote domain...
You can try to disable all 3rd party applications on the server and then restart the smtp service.. and test it again...
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caitechAuthor Commented:
It appears to be a problem with VBA Macros and our firewall not allowing them to come through.
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