PTR Record, what exactly does it do
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?
Any advice would be very much appreciated.
Cheers
