Exchange 2007 SMTP errors

With my new Exchange 2007 installed, I now see random messages being returned as undeliverable.  On Exchange 2000, these didn't normally occur.  I've verified that the email address is correct.  The same recipients can receive emails before and after the error occurs.

Here's two error messages to two different recipients.
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Reporting-MTA: dns;EXCHANGE.kmaone.com
Received-From-MTA: dns;msmail.kmaone.com
Arrival-Date: Wed, 8 Aug 2007 15:43:31 +0000

Final-Recipient: rfc822;xxxxxxxx@us.ibm.com
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp;500 Firewall Error
Remote-MTA: dns;e1.ny.us.ibm.com
X-Display-Name: xxxxx xxxxx
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Reporting-MTA: dns;EXCHANGE.kmaone.com
Received-From-MTA: dns;msmail.kmaone.com
Arrival-Date: Wed, 8 Aug 2007 17:42:01 +0000

Final-Recipient: rfc822;biljana.vareskic@sap.com
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp;550 <xxxxxxxxxxxxxxx@sap.com>... illegal mail address
Remote-MTA: dns;smtpde01.sap-ag.de
X-Display-Name: xxxxxxxxxxxxx
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WayneKMAAsked:
Who is Participating?
 
stafiCommented:
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mzalfresCommented:
From this report, it looks that remote  MTA says, that "biljana.vareskic@sap.com" is incorrect address. It is not a problem of your exchange. Message is returned from "smtpde01.sap-ag.de" machine. You can check with admin of remote MTA if the address is really bad, or your exchange is doing something strange.

Final-Recipient: rfc822;biljana.vareskic@sap.com
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp;550 <xxxxxxxxxxxxxxx@sap.com>... illegal mail address
Remote-MTA: dns;smtpde01.sap-ag.de
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WayneKMAAuthor Commented:
As it turned out, the recipient's site has a hard limit on email size.  But instead of the usual error message of an email too large, the weird error message noted above was the response.   Smaller messages go through without any issue.  The other site just happened once, probably a glitch.
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