Reverse DNS for E-Mail Server

[xbamaris]

Hello all,

 

 

I am requesting help on getting reverse dns working so that my clients can receieve emails without it being blocked by their respective email providers because of missing reverse dns

 

 

I manage our nameservers for our domain using Windows Server DNS but I cannot seem to get reverse DNS to work correctly.

 

I have created the network zone for it and have created the PTR record for the smtp IP address but it does not appear to ever catch on and the only way it seems to work is if I am on the local network for doing a nslookup for one of the nameserver locations

 

(I have 3 nameservers, 2 are remote, 1 is local, primary is on a remote network and are replicated to the other 2)

 

 

 

Any screenshots you need let me know for the current setup.

[+BudMan MVC]

Do you own your netblock?  Per Arin or Ripe or APnic, etc. depending on what region of the world your in?

 

PTR is maintained by the ISP that has control over the IP space your using, they could of delegated it to your control, etc.  Then you can point the netblock your using to a name server to serve up your in-addr.arpa zone for your netblock.

 

Here is the thing - you can host it up all you want of your name servers, doesn't mean anyone is gonig to come ask you.

 

So neowin is on doing a trace on their ip

 

; <<>> DiG 9.9.3-P2 <<>> -x 74.204.71.246 +trace

 

now cut way down  - first you talk to roots

 

.                       157214  IN      NS      i.root-servers.net.
.                       157214  IN      NS      g.root-servers.net.
.                       157214  IN      NS      k.root-servers.net.
.                       157214  IN      NS      d.root-servers.net.

 

Then you talk to one of the in-addr.arpa servers

 

in-addr.arpa.           172800  IN      NS      c.in-addr-servers.arpa.
in-addr.arpa.           172800  IN      NS      f.in-addr-servers.arpa.
in-addr.arpa.           172800  IN      NS      a.in-addr-servers.arpa.

 

;; Received 643 bytes from 2001:500:2f::f#53(f.root-servers.net) in 532 ms

 

Then you get sent to the RIR for that netblock

 

74.in-addr.arpa.        86400   IN      NS      r.arin.net.
74.in-addr.arpa.        86400   IN      NS      t.arin.net.
74.in-addr.arpa.        86400   IN      NS      u.arin.net.

 

;; Received 399 bytes from 199.253.183.183#53(b.in-addr-servers.arpa) in 369 ms

 

Unless this ends up pointing to your nameserver - then no they are never going to query you for the ptrs you have setup.

 

Who is the ISP that provides the IP that these email servers are on?  Contact them to setup your PTR.