Attachments Corrupted over a certain size from one organization

Posted on 2009-02-10
Last Modified: 2012-05-06
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?
Question by:caitech
    LVL 11

    Expert Comment

    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.

    Author Comment

    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)

    LVL 17

    Expert Comment

    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 ?
    LVL 17

    Expert Comment


    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...

    Accepted Solution

    It appears to be a problem with VBA Macros and our firewall not allowing them to come through.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    The problems with reply email signatures

    Do you wish that you could place an email signature under a reply? Well, unfortunately, you can't. That great Exchange/Office 365 signature you've created will just appear at the bottom of an email chain. What a pain! Is there really no way to solve this? Well, there might be...

    Suggested Solutions

    You might have come across a situation when you have Exchange 2013 server in two different sites (Production and DR). After adding the Database copy in ECP console it displays Database copy status unknown for the DR exchange server. Issue is strange…
    Create high volume marketing opportunities using email signatures with these top 10 DOs and DON'Ts of email signature marketing.
    To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates‚Ķ
    how to add IIS SMTP to handle application/Scanner relays into office 365.

    737 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now