Hi, I am gettign from one of my clients server the Status: 5.2.3 NDR emails whenever someone sends attachments to the server The attachment limits are at least twice the size of the test file i am sending them, but still this keeps happening Checked all the size limts and they are wel and truly above the size of the file yet they still get rejected They user mailbox is not at it size limits and I have tried other users with various size mailboxes same result This didnt start till a failed server re-boot last night SBS 2003 and Exchange 2003 SP2 Reporting-MTA: dns;client.com.au Received-From-MTA: dns;mymailserver.com.au Arrival-Date: Fri, 10 Jun 2011 10:48:03 +1000 Final-Recipient: rfc822;user@client.com.au Action: failed Status: 5.2.3 X-Display-Name: Users Name

So just an update it is in fact not all attachments, just the one larger then ~6mb Anything less then that works fine, despite the limtis at ~20mb

Hi, Please uncheck the following options and see if the issue persists: Globally Setting: Receiving message size (Maximum KB) Default SMTP Virtual Server Properties: Limit message size to (KB) 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. Thanks Gen Lin-MSFT

Hi, Tied both of those options and no luck Still seems to bounce the messages back to us Still do seem to be having much luck with it yet

Hi, Please try to disable the STMP virtual server and create a new temp SMTP virtual server and see if the issue persists.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. Thanks Gen Lin-MSFT

So I created a new SMTP virtual Server and sent a larger then 6mb email And so far it has disappeared, it has not shown up in my test account and no rejection email has turned up at the other end It seems to have vanished somewher between the 2 email servers Normal Email worked fine, seemed to send and recieve fine

So I have an update to this issue It seems it was the 'Sending Message size' limit in 'Message Delivery' that was causing the block Even though Recieving was set to no limit and this had not been an issue before So my question becomes why is the server using 'Sending Message size' for incoming email? This seems very strange behaviour for it and makes wonder what else may be not working correctly

Hi, Yes, the problem should be caused by the 'sending message size' limitation. Please see the following Kb article that explains why this behavior happens: An e-mail message that is larger than the sending message size limit or the receiving message size limit is not delivered http://support.microsoft.com/kb/298572 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. Thanks Gen Lin-MSFT

So, basically change both Message Size's to match what you want for incoming and outgoing email? Why have both then? If really only need one option