PTR entries for mail server

[ravin_ps]

Hi

I have Bind dns server/web server and mail server. I have been facing one problem while sending mails. Some of the mails come back with error saying a valid PTR record not found. My setup is as below:

DNS server/web server
ns1.abc.com x.x.x.34
ns2.abc.com x.x.x.35

mail server
x.x.x.37

total 5 domains are hosted on above dns server/web server and mail server. Please guide me on proper DNS entry and PTR record for each domain. I checked on net but got confused.

[jledhead]

DNS/BIND resource record: PTR reverse lookup record - Tech-Recipes.com
maybe something like that?

[Lazydog]

In your reverse zone you need to add the ip address like so;

37        PTR    mailserver.domain.com.

[ravin_ps]

But my mail server host name is mail.xyz.in, then what would be the PTR in zone file ?
Also do I need to have separate reverse zone files for all 5 domains ?

My detailed setup is as below:

ns1.abc.com x.x.x.34
ns2.abc.com x.x.x.35

mail hosting server is zimbra collaboration suite and the hostname is -> mail.xyz.in and IP address is x.x.x.37

5 domains:

abc.com
xyz.in
test.com
test.org
ghi.com

The name server is also web server and handles all above 5 domains as far as dns and http is concerned. so all domains have single IP address i.e.x.x.x.34 & 35
Mail server handles above 5 domains and have IP address x.x.x.37