We receive mail from a lot of outside domains, but we are having trouble receiving mail from one outside domain. We did not have trouble before the upgrade to Exchange 2003.
At first, it would appear that the mail was just vaporizing into cyberspace, so I had one of the users send a message to me at my work address and my home address. The message was received immediately at my home address. Three days later, it arrived in my work inbox. I checked the headers and found that the message left the sender's box right away, and was delivered immediately to my inbox after our server reported it as received.
The problem seems to only occur when the sender from the outside domain initiates the e-mail. If they reply to one of our e-mails, I have been told there is no delay. We also have no problem sending to them.
I am inclined to think that the problem is not on our end. However, there were no problems prior to the upgrade. There also doesn't appear to be any way to track down where the bottleneck might be.
What should I look for here? Should our FQDN be mail.ourdomain.com instead of the server name? What should I suggest that the sender look for? The sender is using Novell GroupWise Internet Agent 6.5.2. Is there an issue with GroupWise and Exchange 2003?
Any suggestions are appreciated as we have a lot of dealings with this company and my users are getting antsy.
I also telneted to port 25 on your MX record listing -- I am not getting an Exchange front-end response, so you may want to look at the logical and physical mail flow within your organization. Maybe there are antivirus or spam boxes that sit in the DMZ to accept and forward mail to your front-end Exchange 2003 server.
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