Recipient limits not working correctly

I am running Exchange 2003. Global setting are No Limits for sending and receiving, Mailbox Store settings are all cleared for Limits, subject User mailbox setting on AD account is Use Default.  This user was the reciepient of an email with a 6MB attachment that resulted in 5.2.3. It looks to me as though things are wide open on my exchange server and there should be no limits.  There is no policy set for limits. This has been stumping me for a while.

Thanks
orca26Asked:
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MNH1966Connect With a Mentor Commented:
Could be on the sender's server, could also be in the settings of you SMTP Virtual Server (properties / Messages tab)
I'm guessing you checked that, so sender's server is more likely. I am assuming your server receives the e-mail directly from the Internet?!?
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SembeeCommented:
If you got an SMTP error message it may not be your server rejecting it.
The best practise on SMTP email delivery is to reject the message at the delivery point and force the sending server to reject the message. The recipient side may have a limit.

Simon.
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orca26Author Commented:
Slightly confused by your response. My user is the reciepient of the 6MB email.  The sender gets the smtp 5.2.3.  So it could be limits on the sender's server?  Thanks
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SembeeConnect With a Mentor Commented:
It wasn't clear from your question who was the sender and who was the recipient.
There are always at least two servers involved with email delivery, it can be as high as four - all of which can reject the message and cause the NDR. Your server is just one of them, and could be the only one that you have control over.

If you are the recipient then I would suggest trying another external email account where you do have access to see if you can send emails of that size. If you can, then it would appear to be a problem that is outside of your control.

Simon.
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