Hi,I am running Exchange 2003 on Windows Server 2003 SP2 and suddenly starting having the problem of not receiving mail from one domain. All other domains seem to be fine, although seem slower to receive mail than normal. The sender of the domain in question does not receive any NDR or bounce back error messages, so they are none the wiser the mail has come through. I have checked the junk/spam, I don't have any filters which could be blocking the domain.Any ideas??Thanks

Hi Lorale,1. Are you able send mail manually via SMTP to the problamatic domain? XFOR: Telnet to Port 25 to Test SMTP Communication http://support.microsoft.com/?id=153119 2. Check your DNS settingsarecorrect and pointing to correct MX records of problamatic domain.- Check from internal network.How to Use Nslookup to Verify MX record configuration http://technet.microsoft.com/en-us/library/aa998082(EXCHG.65).aspx - Check from the internet with below tool and make sure that both are pointing to correct MX addresses.http://mxtoolbox.com/Amit Tank || MVP - Exchange || MCITP - Exchange 2007 || http://ExchangeShare.WordPress.com

Hi, Please enable the protocol log on SMTP virtual server to check whether the remote domain has attempted to connect to your exchange server to send email to you. If the remote domain has attempted to connect to your exchange server, please check whether the message is received by the SMTP server. If the message has been received, please use the message tracking log or queue viewer to check whether the message stuck on the server. If the message is rejected, you can use protocol log to gather further information. If the remote domain does not attempt to connect to your exchange server, I think you need to work with the remote domain admin regarding the issue as other domains are able to send email to you with no problem. Mike