How to format DNS PTR record ?

[pcom]

We have been told by AOL that our email to it
is blocked because we do not have a reverse record
defined.

We defined it - but it seems incorrectly ?

When we check with dnsstuff.com it says:
"No PTR record defined".

Can someone who is a DNS export please help
with this ?

-> Thank you so very much !


in file: /etc/named.conf
======================================
zone "pcom.com" {
type master;
file "pcom.com.hosts";
};
zone "8.48.51.64.in-addr.arpa"{
type master;
file "/var/named/8.48.51.64.rev";
};


in file: pcom.com.hosts:
======================================
$TTL 38400
pcom.com. IN SOA ns1.pcom.com. hostmaster.pcom.com. (
200205058 ;
10800 ;
3600 ;
604800 ;
86400 ) ;

pcom.com. IN NS ns1.pcom.com.
pcom.com. IN NS ns2.pcom.com.

localhost.pcom.com. IN A 127.0.0.1
mail.pcom.com. IN A 64.51.48.8
pcom.com. IN MX 10 mail.pcom.com.
ns1.pcom.com. IN A 64.51.48.8


in file:
======================================
$TTL 38400
8.48.51.64.in-addr.arpa. IN SOA ns1.pcom.com. hostmaster.pcom.com. (
2004062901
10800
3600
604800
38400 )
8.48.51.64.in-addr.arpa. IN NS ns1.pcom.com.
9.48.51.64.in-addr.arpa. IN NS ns2.pcom.com.

8.48.51.64.in-addr.arpa. IN PTR ns1.pcom.com.
8.48.51.64.in-addr.arpa. IN PTR lin.pcom.com.
8.48.51.64.in-addr.arpa. IN PTR mail.pcom.com.


pcom is just an example of what we are using. The format of the records are exactly like that though...the numbers and names have been changed to protect the innocent...

We co-locate our server and so you are saying that we have to approach our ISP even though we are running our own DNS server for the domains we host...but I did notice that the main IP addr has a reverse entry that points back to the ISP - of course they own the whole block...