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Old February 13th 20, 06:31 PM posted to uk.telecom.broadband
Angus Robertson - Magenta Systems Ltd
external usenet poster
Posts: 132
Default Changing DNS PTR entries

Does anyone know of a company that will allow me to change my DNS
PTR entry?

Gmx are using what is said to be a deprecated method of
validating email, i.e. they are checking the reverse DNS (PTR)

Reverse DNS does not use a PTR in the forward domain zone, it's a PTR in an IP
address zone, which is controlled by whoever issues the IP addresses, not the
domain name. I have two blocks of addresses, and have zones similar to the
following in my DNS server;
137 PTR
138 PTR
139 PTR
140 PTR
141 PTR

but I have to send them to may ISP who actually controls the IP ranges to be
merged into their DNS records, which is a slow business. So you need a decent
business ISP that allows DNS updates.