When users send emails to some china addresses some of the emails are not getting through and some are. These messages just started out of nowhere and i am not sure how to trouble shoot.
I have done some looking around but i am unable to locate any help on this issue. Here is an example of the error msg users get when sending mail to these addresses.
firstname.lastname@example.org on 10/23/2006 4:09 PM
The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.
<exchange.domainA.com #5.0.0 smtp;551 User not local; please try <forward-path>>
We are running Exchange 2003 with a mail relay server running mail essentials and mail security.
any idea would be great!