Exchange 2010 and reverse DNS

Hi
I have two exchange 2010 servers:  x.x.x.72 and x.x.x.73
I have a reverse DNS ptr record for both of these machines pointing back to mail.mydomain.com
My users are getting an error message when they try to send mail to a craigslist.com address.
The error I see in the log is:
mail.mydomain.com [x.x.x.73] Please setup matching DNS and rDNS records: http://www.craigslist.org/about/help/rdns_failure
I have an A record [mail.mydomain.com] pointing back to .72
BUT I don't have an A record pointing back to .73.
So, I'm wondering is that what I need to do, create another A record and point .73 back to mail.mydomain.com
I was concerned having two A records pointing back to the same  mail.mydomain.com. I wasn't sure if that would cause any problems.
Or should I create a send connector on .72 and only allow mail to be sent out for craigslist.com?
As you can see, I'm unclear on the best way to solve this.
Any advice is welcome.
Thanks!
Mike

Hi ,
If you wanted to use the x.x.x.73 ip address to send emails to internet then you need to have the proper A record and PTR records .
Please have a look in to the below mentioned points .Based upon the provided description i thought you are having like below.
Host A record :
mail.mydomain.com 192.168.1.72 
PTR record :
192.168.1.72 mail.mydomain.com
Then on the send connector configuration you need have the smarthost as 192.168.1.72 to send emails to internet otherwise your emails get failed if the remote host has done reverse dns check.check. Because on your side i thought you don't have the proper
A records and PTR records for x.x.x.73
In case if you would like to have two A records .Please have the settings like below :-
Host A record :
mail.mydomain.com 192.168.1.72 
mail1.mydomain.com 192.168.1.73 
PTR record :
192.168.1.72 mail.mydomain.com 
192.168.1.73 mail1.mydomain.com 
On the above configuration you can make use of the both the ip's on the smarthost in the send connector to send emails to internet.
Note : You can make use of MXTOOLBOX to check the A and ptr records for your domain.
Please reply me if anything is unclear.
Thanks & Regards S.Nithyanandham

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