John, I wouldn't go as far as saying no Domain registrar supports PTR records. Let me show you: autosoldnow.com on Network Solutions: (FAIL) Reverse DNS entries for MX records ERROR: The IP of one or more of your mail server(s) have no reverse DNS (PTR) entries (if you see "Timeout" below, it may mean that your DNS servers did not respond fast enough). RFC1912 <http://www.DNSstuff.com/pages/rfc1912.htm> 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mail servers will not accept mail from mail servers with no reverse DNS entry. You can double-check using the 'Reverse DNS Lookup' tool at the DNSstuff <http://www.DNSstuff.com> site (it contacts your servers in real time; the reverse DNS lookups in the DNS report use our local caching DNS server). The problem MX records are: 126.96.36.199.in-addr.arpa [No reverse DNS entry (rcode: 3 ancount: 0) (check it <http://www.dnsstuff.com/tools/ptr.ch?ip=188.8.131.52> )] Smoothrunnings.ca on Register.com: (PASS) Reverse DNS entries for MX records OK. The IPs of all of your mail server(s) have reverse DNS (PTR) entries. RFC1912 <http://www.DNSstuff.com/pages/rfc1912.htm> 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mail servers will not accept mail from mail servers with no reverse DNS entry. Note that this information is cached, so if you changed it recently, it will not be reflected here (see the www.DNSstuff.com Reverse DNS Tool for the current data). The reverse DNS entries are: 184.108.40.206.in-addr.arpa 206-248-138-108.dsl.teksavvy.com. [TTL=3600] Regards, Andrew ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of John T (Lists) Sent: Monday, May 15, 2006 5:53 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: Exchange Que Once again Andrew, you are incorrect. No Domain name registrar supports PTR records for a very valid reason; PTR records can only be created by the entity that controls the IP address, of which no Domain registrar does. John T eServices For You "Seek, and ye shall find!"