Microsoft KB Archive/150114

= XFOR: IMC Doesn't Appear to Use All Mail Exchangers =

Article ID: 150114

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition

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This article was previously published under Q150114



SUMMARY
When you compare the results between Nslookup.exe and Restest.exe, it may appear that the Microsoft Exchange Internet Mail Connector (IMC) is not resolving all mail exchangers for a given domain.



MORE INFORMATION
For example, you may notice a discrepancy between the number of mail exchangers listed by Restest.exe and Nslookup.exe on the following query.

Below is a sample run of Restest.exe:

C:\my documents>e:restest -debug aol.com

***  Matches Microsoft Exchange Server build 4.0.0736   ***

host[0] = '198.81.11.33' host[1] = '198.81.11.14' host[2] = '198.81.11.37' host[3] = '198.81.11.15' host[4] = '198.81.11.52'

Notice that Restest.exe displays 6 mail exchangers for AOL.COM. Nslookup.exe appears to show more mail exchangers.

Below is a sample run of Nslookup.exe:

> server hp81.prod.aol.net Default Server: hp81.prod.aol.net Address: 192.203.190.18

> set type=MX > aol.com. Server: hp81.prod.aol.net Address: 192.203.190.18

aol.com preference = 15, mail exchanger = e.mx.aol.com aol.com preference = 15, mail exchanger = f.mx.aol.com aol.com preference = 15, mail exchanger = a.mx.aol.com aol.com preference = 15, mail exchanger = b.mx.aol.com aol.com preference = 15, mail exchanger = c.mx.aol.com aol.com preference = 15, mail exchanger = d.mx.aol.com aol.com nameserver = ops01.ops.aol.com aol.com nameserver = dns-aol.ans.net aol.com nameserver = hp81.prod.aol.net e.mx.aol.com   internet address = 198.81.11.18 e.mx.aol.com   internet address = 198.81.11.20 e.mx.aol.com   internet address = 198.81.11.12 e.mx.aol.com   internet address = 198.81.11.15 f.mx.aol.com   internet address = 198.81.11.51 f.mx.aol.com   internet address = 198.81.11.52 f.mx.aol.com   internet address = 198.81.11.53 f.mx.aol.com   internet address = 198.81.11.54 f.mx.aol.com   internet address = 198.81.11.50 a.mx.aol.com   internet address = 198.81.11.28 a.mx.aol.com   internet address = 198.81.11.29 a.mx.aol.com   internet address = 198.81.11.30 a.mx.aol.com   internet address = 198.81.11.11 b.mx.aol.com   internet address = 198.81.11.32 b.mx.aol.com   internet address = 198.81.11.33 b.mx.aol.com   internet address = 198.81.11.13 b.mx.aol.com   internet address = 198.81.11.31

Although Nslookup.exe shows many more IP addresses listed for aol.com, there are still only 6 mail exchangers (a.mx.aol.com .. f.mx.aol.com). AOL has multiple, redundant hosts listed for each mail exchanger.

Microsoft Exchange, and Restest.exe, are working correctly.

Keywords: kbusage KB150114

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