Reverse DNS on Exchange 2010
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!
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!
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Glad you worked it out. In case you're wondering, this is known as forward-confirmed reverse DNS.
ASKER
Is changing the SMTP banner on the second mail server needed?
Thanks again!
I didn't know that was the name for it.
Thanks again!
I didn't know that was the name for it.
From what I've seen, not as many people check your SMTP banner, but yes it is good practice to have the banner match the name used for the matching DNS records.
ASKER
I just realized that before I read your response.
Nacht