På samma sätt som till ett A record.
Det viktiga är att det finns ett PTR record dock behöver den nödvändigtvis inte peka på det namnet som MX recordet har.
Trådstart#1
hur skriver man en reverse dns till en mx-pekare?
får detta felmess på dnsreport.com:
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 2.1 says
you should have a reverse DNS for all your mail servers. It is
strongly urged that you have them, as many mailservers will
not accept mail from mailservers with no reverse DNS entry.
You can double-check using the 'Reverse DNS Lookup' tool at
the DNSstuff site. The problem MX records are:
xxx.xxx.xxx.xxx.in-addr.arpa No reverse DNS entry (rcode: 3 ancount: 0)