email / PTR

[HMTKSteve]

My email is being bounced by some companies because (I think) of the PTR record. Is it possible to just find out what your ISP has set for the PTR and change your hostname to it to make everything work? Or will that not work because they use their own registered myisp.com in the PTR record?

 

[floyd]

Its best if the hostname matches the PTR of the ip address.

Check to see what the PTR currently is:
http://www.iptools.com/dnstools.php?tool=rdns&user_data=

 

[HMTKSteve]

When I use that tool I get : 24.151.2.138 is 24-151-2-138.static.nwtn.ct.charter.com.

I also used dnsqueries to test the domain (hmtk.com) and recieved the following error message:

The configuration of your mail servers and your DNS are not ok! The report of the test is: 
mail.hmtk.com. -> 24-151-2-138.static.nwtn.ct.charter.com -> N.C.

Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.

I checked another domain on my server (not fully moved yet) and received the same:

The configuration of your mail servers and your DNS are not ok! The report of the test is: 
mail.artistwar.com. -> 24-151-2-138.static.nwtn.ct.charter.com -> N.C.

Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.

Should I simply set my hostname to match the one currently in the PTR record or will that fail because I don't own charter.com?

I'm confused.

 

[floyd]

the hostname given in the SMTP greeting MUST have an A record

What is your hostname? Does it resolve to an ip? Please give us the hostname so we can check it.

You upstream provider should really set the PTR to your hostname.

 

[HMTKSteve]

The hostname is currently set to: 24-151-2-138.static.nwtn.ct.charter.com.

I thought setting it to what is in the PTR record would allow things to work. I do not currently have access to the server so I can not change the hostname until later today.

Previously it was set to server1.hmtk.com.

 

[floyd]

the hostname given in the SMTP greeting MUST have an A record

The hostname is currently set to: 24-151-2-138.static.nwtn.ct.charter.com.

There is no A record for 24-151-2-138.static.nwtn.ct.charter.com.

 

[HMTKSteve]

Let me see if I understand what I need to do.

If I change the hostname of the server to "server1.hmtk.com" I should then:

1) Create an A record in my DNS for server1.hmtk.com pointing to 24.151.2.138
2) Contact Charter to have the PTR record changed from "24-151-2-138.static.nwtn.ct.charter.com" to "server1.hmtk.com"

 

[floyd]

Yes change your hostname to server1.hmtk.com

1) Create an A record in my DNS for server1.hmtk.com pointing to 24.151.2.138

Already done. http://www.iptools.com/dnstools.php?tool=dns&user_data=server1.hmtk.com&type=A

2) Contact Charter to have the PTR record changed from "24-151-2-138.static.nwtn.ct.charter.com" to "server1.hmtk.com"

Yes.