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SMTP timeout incoming from only 1 domain

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by joshua1 2 views

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I set up my Exchange 2000 network a couple of months. My highest priority problem right now is that I am having trouble receiving mail from ONE Internet domain. That's it, just one. When users from that domain send mail to any user mailbox on my network, I get problems. Occasionally messages arrive immediatelly, no problem. Most times the message will make it through after 4,6,12 hours or more. I received one that took 30+ hours. Some of these pass the 48 hour mark and fail. During thistime, I experience no other inbound mail failures from other domains.

I can't find any related errors in Event Viewer. I have no bottlenecks at my server, on my LAN or at my e-mail gateway. My ISP did bandwidth monitoring on my node for 2 days, no bottlenecks. Is this a problem w/ the senders ISP, My ISP, DNS routing? Could it be a config problem on my server?

thx.

3 replies

by rcc

Hi
Have you checked the message header of one of the delayed messages? This should offer you info if there is anything wrong with the routing coming from that particular domain (host).
Check your MX records if you have host routing and priorities set (preference levels).
Last, I had a similar problem and it turned out that the host sending the messages could not get a clear DNS name resolution to my MX record due to configuration problems at that end. If is possible, try contacting the postmaster at the other end and ask him to help you troubleshot.
Regards,
Radu

by joshua1

It was definately the sending domain, I was just having a very hard time proving it. thx.

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