How to create Reverse DNS entries for MX records??

  • Thread starter Thread starter Joe M
  • Start date Start date
J

Joe M

Their will be problems receiving emails if the "Reverse DNS entries for MX
records" is not created. But I am clueless as to how to create "Reverse DNS
entries for MX records" on a DNS server. I can easily create the MX records
on my public DNS servers, but how do I create the Reverse DNS entries???
Thanks
 
In
Joe M said:
Their will be problems receiving emails if the "Reverse DNS entries
for MX records" is not created. But I am clueless as to how to
create "Reverse DNS entries for MX records" on a DNS server. I can
easily create the MX records on my public DNS servers, but how do I
create the Reverse DNS entries??? Thanks
Click to expand...
The problem is not the receiving without the reverse lookup it is sending,
many mail servers will not accept mail from mail servers without a reverse
lookup.

You will most likely have to get your ISP to configure reverse lookup for
you.
 
1) Create a Host (A) record for each mail server. At the time of creation,
ensure that PTR box is checked
2) Create the MX record by pointing it your (A) record

Please remember that reverse lookups always go to the DNS server(s) that are
authoritative for the IP address. For example, if my IP subnet belongs to
MCI, then reverse looks will go to their DNS servers unless they delegate
the subnet to a dns server I own. If they don't delegate the subnet, then
the ISP needs to create the reverse for the site on their servers.
 
Their will be problems receiving emails if the "Reverse DNS entries
for MX records" is not created. But I am clueless as to how to create
"Reverse DNS entries for MX records" on a DNS server. I can easily
create the MX records on my public DNS servers, but how do I create
the Reverse DNS entries??? Thanks
Click to expand...
Who hosts your public DNS records? Are you using the DNS services
provided by your ISP? The organization that I work for has used AT&T and
UltraDNS (third party so that ISP isn't a point of failure) and they were
both a little different to set up. AT&T automatically created the
reverse lookup zone, and I needed to create records in that zone
(x.y.z.in-addr.arpa). With UltraDNS, we needed to create the x.y.z.in-
addr.arpa zone and then create the records.
If you are using Microsoft DNS as a public DNS server, you will need to
create the x.y.z.in-addr.arpa zone and then create the records.
Adam
 
The reverse lookup for an A record is a PTR (pointer) record. There is no
reverse record for an MX record. You would need to create a PTR record for
the A record of the target host of the MX record. I'm not positive, but I
think mail servers that implement this sort of security use a forward
lookup, in which case a PTR record would not be necessary.
 
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