turning off 8BITMIME in Windows Server 2003 SMTP service, but it keeps turning back on!

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I keep an eye on all the NDR's for my company.

I've been seeing a lot of the following NDR's:

The message contains a content type that is not supported
            <tsc.republictitle.com #5.6.1 smtp;554 5.6.1 Body type not supported by Remote Host>

I found the following KB on Microsoft website:  http://support.microsoft.com/kb/262168

Several times I've applied the changes to all my mailservers, and a few days later I'll start seeing a lot of NDR's with the error same error again.  When I go back and check the servers again the 8BITMIME support will be turned back on some but not on others.  It seems to be totally random.  As soon as I turn it off, the NDR's stop.

Does anyone know why this is happening and what I can do remedy it permanently?

Thanks in advance for your help!
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Commented:
This is not something that you would normally have to do. I don't think I have ever had to do it on any site I have worked on.
Are you getting these NDRs from one specific domain?
Normally the problem is caused by something getting in the way - antivirus, antispam, firewall etc.

I see that you don't have the Exchange server answering the email, so I would start looking at the appliance that is, to ensure that it is passing all the information across correctly.

Simon.

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Commented:
Sembee,

It seems to only come from domains using a webmail app of some sort (i.e. yahoo, hotmail, etc.), but it does happen with multiple domains.  I found this kb (http://support.microsoft.com/kb/257569/) article yesterday after posting the question and used it's steps to turn off 8BITMIME.  Since applying the fix I've had nearly 400 NDR's and none with the above error, when before roughly 10%-20% of total NDR's were 5.6.1's.  Now I just need to wait and see if the change I made reverses itself again.  

I'll keep you posted...

BTW, we use a barracuda mail appliance, and I've taken it out of the equation previously, and still had the issue with the 5.6.1's.
Expert of the Year 2007
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Commented:
I still don't think that making that change is the real fix for this problem. Webmail accounts are very popular and every email server will receive email messages from a webmail account. If there was a problem with them then it would be well known and the problem would have been fixed. The change that you have made is not something that I have had to make to allow web mail services to send email to the server.

Simon.

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