The PTR record is the A record counterpart.  PTR resource record, is used to map an IP address to a host (computer or other network device) name in a DNS reverse zone (those in the In-addr.arpa DNS domain).
 
To set it up -I assume you are using DNS Manager under NT/2K-
 
add the address   3.12.17.208 in-addr.arpa  IN PTR  mail.jcws.net
 
that means you add the record using the query 

<ip reverse domain name> IN PTR <host name>

IP numbers are written in backward order and "in-addr.arpa." is appended to the end to create this pointer record.
 
You can see an example on how to add a PTR record using this link
 
for even more info you can check MS white paper
File Name: Dnswp.exe
Location : ftp://ftp.microsoft.com/bussys/winnt/winnt-docs/papers/
Title : "DNS and Microsoft Windows NT 4.0"
 
 
I suggest you use www.dnsreport.com to get a report of your domain (DNS). It's a neat link. check out and compare results looking at microsoft.com, ibm.com, dell.com, hotmail.com, yahoo.com, etc.
 
 
Good Luck
 
 
Luis Arango
----- Original Message -----
Sent: Friday, August 17, 2001 1:56 AM
Subject: Re: [IMail Forum] DNS records

how do i set up the reverse-lookup record
i set the MX and A record now how do i set up the reverse thank you very much
----- Original Message -----
Sent: Thursday, August 16, 2001 9:24 PM
Subject: Re: [IMail Forum] DNS records

You can do this.
 
Create an A record named for example mail.jcws.net and make it point to 208.18.12.3
Then create a MX record pointing to mail.jcws.net  priority 10
 
I suggest also to create a PTR (reverse-lookup) record that resolves the IP address of your IMail PC to the Official Hostname of your IMail domain. (Many large ISPs will drop your connection if they cannot match your IMail hostname with a PTR record for your IP address.)
Wait between 16 and 24 hours for the new DNS information to properly propagate around the world, so if you sent an email to @jcws.net it recognizes the new MX information.
 
Good Luck.
 
Luis Arango
----- Original Message -----
Sent: Friday, August 17, 2001 12:53 AM
Subject: [IMail Forum] DNS records

how do i setup my DNS records for Imail
win2000 server. domain name is jcws.net ip address is
208.18.12.3 and do i set the records up for that. can anyone help please. kinda new at dns and MX records any help would be appreciated thanks.
 

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