Can anyone tell me or guide me to a right place where i can find out what exactly some ISP's do by checking the PTR record. I am quiet confused.
Lets say i send an email via an ASP script from my server, does the ISP take the IP of the SMTP server and do a Revert PTR on that, or does the ISP check the "From" email address and do a reverse PTR on the domain of that email?
PTR is a reverse DNS record. Most SMTP servers do reverse DNS checking to allow or disallow acceptance of the message. The IP address of your server needs to both forward and reverse match. If your servers IP is 188.8.131.52 and named server.domain.com If you do an nslookup on server.domain.com you should get 184.108.40.206 and if you do it on 220.127.116.11 you should get server.domain.com
yes i have set my server name to server.domain.com and when you lookup server.domain.com it points to that IP and when you reverese lookup the ip it gives me server.mydomain.com but the problem is when i lookup my IP it gives me server.mydomain.com but it also addds a X.X.X.IN-ADDR.ARPA. extension to it. Does this matter?
How are you looking up the IP address to see the reverse? Are you using nslookup? If so it should ONLY show you your servers Fully Qualified Domain Name (FQDN). server.domain.com if it says server.domain.com.x.x.in-addr.arpa then you might have the zonefile configured incorrectly. Are you hosting the reverse record?
Then you should contact whatever company owns that IP address and ask them to put the period at the end of server.domain.com for your IP in there x.x.x.in-addr.arpa record. If you want me to verify what your saying just PM me the IP addres "if you don't want to publish it on here".