Hello, We are still on Exchange 2003. I have been told that not all senders who are sending email to us over our attachment size limit (10MB) are getting the delivery status notification 5.2.3 email, so they never know that the email wasn't delivered. I sent large test messages from gmail and yahoo accounts and did receive the NDR report. My question is, is this a problem on our end or is it a problem on the receiving end. Maybe they are blocking NDRs? I can't seem to find much help googling so if someone could give me a quick reply I would really appreciate it. Thanks.

If you send a large attachment to another internal user do you get an NDR? Can you see if you disable NDRs? How to control non-delivery reports when you use Exchange 2000 or Exchange 2003 http://support.microsoft.com/kb/294757James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

On Thu, 10 Mar 2011 20:15:49 +0000, shamrock0 wrote: >We are still on Exchange 2003. I have been told that not all senders who are sending email to us over our attachment size limit (10MB) are getting the delivery status notification 5.2.3 email, so they never know that the email wasn't delivered. > >I sent large test messages from gmail and yahoo accounts and did receive the NDR report. > >My question is, is this a problem on our end or is it a problem on the receiving end. Maybe they are blocking NDRs? > >I can't seem to find much help googling so if someone could give me a quick reply I would really appreciate it. If the sender uses ESMTP they'll see the "SIZE" keyword in your server's set of advertised keywords. If the sender's intellegent it won't try to send an e-mail larger than that limit. If they do do, and they include the "SIZE=xxx" in the MAIL FROM command your server will reject the MAIL FROM and the sending SMTP server will generate the NDR -- that part's out of your control. If they use SMTP to send the e-mail there's no way to know beforehand if a message exceeds your limts so the message is sent and your server sends a NDR -- if you haven't disabled sending NDRs to the Internet. Whether the sending system accepts your NDR is also something that's out of your control. Your SMTP protocol log and your applications log shold inform you of your server's action. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Hi shamrock, Any updates?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.