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

Last reviewed: April 21, 1997
Article ID: Q150114

The Information in this article applies to:

Microsoft Exchange Server, version 4.0

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.

Additional query words:
Keywords : kbtool kbusage XFOR
Version : 4.0
Platform : WINDOWS

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Last reviewed: April 21, 1997
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