I am admitedly not an Exchange expert though I manage a server on a Windows domain. Occassionally, we will have a problem with delayed messages:
Subject: Delivery Status Notification (Delay)
<<ATT1007474.txt>> <<FW: Talking>>
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
Typically, we use a smart host connector provided by our ISP. Why? Not sure I can answer that. At other times, I simply set SMTP to "Use DNS to route each address space on this connector". What seems to determine which method I use is based around what ever clears the queues when they begin to stack up. I know this cant be the correct way of doing things. This AM, frustrated after nothing I did seemed to clear the backlog in the queue (over 1600 messages stacked), I purchased an outbound connector service which I actualy read about here on experts (Mailhop Oubound relay svc. from dyndns.com). As soon as I forwarded all mail through their outbound server, the mail began to clear out. Since it's an outbound connector only, I had to resort back to one of our ISP's connectors. RIght away, mail started to stack up again. A few moments ago, I set it to Use DNS to route each address space on this connector again and the queue cleared.
What am I doing wrong? Thanks.