Experience Exchange Sever

May 17, 2010

Mails to certain domains does not work – Additional information

Filed under: Exchange 2007, TroubleShooting — vijayarelangovan @ 6:23 am

Its a known issue that mail flow certain domains does not work if your exchange server 2007 satisfies the following condition

Condition
* Os : windows 2008
* Exchange : Exchnage 2007

Findings:
I tried the following steps and end up finding few things

1. Mail flow will work to all the domains except few
2. When you smart host to that particular domain, the mail will go through
3. When you do a telnet and drop a mail to the remote domain, mail will go through

This can be resolved by running the hot fix
Mail flow to certain domains does not work when you run Exchange Server 2007 on a Windows Server 2008-based computer

Reason:
When a mail is generated to a remote domain (problamatic domain), the server will query for the AAAA record.

Which is odd.

You can test this by running a netmon trace.

So it is obvious that mail will not go through because the remote server will not responsd to the AAAA record query

Soln:
At times running the hot fix won’t fix the problem.  So, Just create a new send connector and add the remote server ip as a smart host for time being

Additional information:
This also happened to me for Exchange server 2010 as well.

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