Delivery Status Notification - Delayed

Exchange 2000
Windows 2000 Terminal Server
256k Internet Bandwidth (partial T1)


My users have been complaining more and more about getting messages like this:

     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.

            blah@blah.com

It's getting worse and worse.  Yesterday we saw some emails (orders sent by customers) took ten hours from being sent to being received by our staff.  I have no idea what is causing the delay.

I would give this 5000 points if I could.
StuartGriffenAsked:
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SembeeCommented:
There can be any number of reasons for a delay message. If the messages are going through eventually then your messages aren't being totally blocked.
Have you looked at the queues to see if there are lots of messages queued there?
How much bandwidth is available? Is the link saturated?
DNS lookups ok? Have you checked the DNS to ensure that it is configured correctly? IF you aren't already, I would suggest putting forwarders on to the DNS Server applet on your domain controllers.

Put your domain name in to dnsreport.com and see if it throws any errors.

As the recipient it is very difficult to diagnose where the delay is.
Does your email come in directly through SMTP or does it come in via another server?
If you look at the SMTP headers of the delayed external messages you should be to diagnose where the delay took place.

Simon.
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