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Issue with Routing / SMTP

Posted on 2006-11-21
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Last Modified: 2010-03-06
We just upgraded 2 MX2000 to MX 2003. One at Site1 "site1.overhere.all.com" & the other at Site2 "site2.overhere.all.com". They are a child domain of "all.com"

Mail flows from Parent to Site1 & from Site1 gets routed to Site2.

The build wasn't too bad (thanks to Sembee), but I have problems stopping the services. Site1's old MX is up but has all MX services & SMTP disabled. When I try to do that for Site2, all mail gets queued at Site1. This is really bizarre.

If I turn off the services on the old MX at Site  - I get this problems:

1. No mail between Site1 & Site2 (should I use smart host or not? - how do I config it ?)
2. All mail for Site1 gets queued at Site2

Please advise.
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Question by:titanax
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LVL 104

Expert Comment

by:Sembee
ID: 17995887
Make sure that you do not have any smart hosts configured on the SMTP Virtual Servers of any machine.
If the servers are in separate routing groups, ensure that they can resolve each other using all combiantions... IP address, FQDN and Netbios name.
If you have adjusted the FQDN on the SMTP virtual server, ensure that name also resolves correctly internally.

Simon.
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Author Comment

by:titanax
ID: 18000522
Hi Sembee...great to hear from you!

1. There are no smart hosts configured
2. When you mean resolve you mean nslookup?
3. FQDN points to itself on both servers
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LVL 104

Expert Comment

by:Sembee
ID: 18004018
If you ping the other server, does the name resolve to an internal or an external IP address?

I don't understand what you mean by "FQDN points to itself on both servers".
The FQDN on the SMTP virtual server is what appears in the SMTP banner. You can see it when you telnet to port 25 of the server.
If that name doesn't resolve internally to the correct IP address of the Exchange server, then you can get problems.
It is often changed so that the server announces itself as its correct external name, so that reverse DNS etc all matches and ensures that email is delivered correctly. However it can cause a problem if not set correct internally. Use the Check DNS button to see if everything is working correctly.

Simon.
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Author Comment

by:titanax
ID: 18026912
yup check dns workd; what i mean is the the FQDN are "site1.overhere.all.com" & "site1.overhere.all.com" respectively, incoming mail is via the parent MX which is located on another continent
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LVL 104

Expert Comment

by:Sembee
ID: 18027926
Are you saying that the FQDN on both machines is the same? If so, that will cause a problem.

Simon.
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Author Comment

by:titanax
ID: 18028711
sorry typo - 2nd machine "site2.overhere.all.com"
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LVL 104

Expert Comment

by:Sembee
ID: 18038192
Are the servers in separate routing groups?
If so, are there routing group connectors in place?

Simon.
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Author Comment

by:titanax
ID: 18058464
yes separate routing groups. Like I said this is a migration, so I checked all RGs & other main configs to ensure that the MX2003 are running the same things as the MX2000...So far they appear to be!
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LVL 104

Expert Comment

by:Sembee
ID: 18061010
Did you recreate the routing group connectors, or are they the old ones with the new servers simply added to the list?

Simon.
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Author Comment

by:titanax
ID: 18061726
the old ones with the new servers simply added to the list
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LVL 104

Expert Comment

by:Sembee
ID: 18063204
I would recreate the routing group connectors then.
Ensure that you have the IP address specifically set on the SMTP virtual servers before you do.

Simon.
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Author Comment

by:titanax
ID: 18065758
OK, do you have any advise on how I can manually recreate the RGs?
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LVL 104

Accepted Solution

by:
Sembee earned 500 total points
ID: 18070237
Delete and recreate. There isn't much to them.
On one server you choose New, Routing Group Connector and choose the server that you want connect to.
Email will queue for a few minutes while you make the changes, but everything settles down very quickly.

Simon.
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