I need assistance in creating a reverse dns entry for my domains:

I did a DNS report at www.dnsreport.com and it says:

Reverse DNS entries for MX records - Fail

ERROR: One or more of your mail server(s) have no reverse DNS (PTR) entries (if you see "Timeout" below, it may mean that your DNS servers did not respond fast enough). RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry. This may be a false positive due to the nasty BIND bug (client side) that causes reverse DNS entries to fail the first time (if you ever see long delays in reverse DNS lookups, that's because of this bug). You can double-check using the 'Reverse DNS Lookup' tool at the DNSstuff site. The problem MX records are:
1111.111.11.111.in-addr.arpa [No reverse DNS entry (rcode: 3 ancount: 0)]

So I went and did a reverse dns lookup on www.dnsstuff.com and it reports the following:

Country: UNITED STATES

Preparation:
The reverse DNS entry for an IP is found by reversing the IP, adding it to "in-addr.arpa", and looking up the PTR record.
So, the reverse DNS entry for 111.11.111.11 is found by looking up the PTR record for
11.111.11.111.in-addr.arpa.
All DNS requests start by asking the root servers, and they let us know what to do next.
See How Reverse DNS Lookups Work for more information.

How I am searching:
Asking g.root-servers.net for 11.111.11.111.in-addr.arpa PTR record:
g.root-servers.net says to go to INDIGO.ARIN.NET. (zone: 111.in-addr.arpa.)
Asking INDIGO.ARIN.NET. for 11.111.11.111.in-addr.arpa PTR record:
indigo.arin.net says to go to NS2.EV1.NET. (zone: 111.11.111.in-addr.arpa.)
Asking NS2.EV1.NET. for 11.111.11.111.in-addr.arpa PTR record: Reports that no PTR records exist.

Answer:
No PTR records exist for 111.11.111.11. [Neg TTL=38400 seconds]

Details:
NS2.EV1.NET. (an authoritative nameserver for 111.11.111.in-addr.arpa., which is in charge of the reverse DNS for 111.11.111.11)
says that there are no PTR records for 111.11.111.11.

To get reverse DNS set up for 111.11.111.11, you need to speak to your ISP (or "bandwidth provider"). You could also
contact admin@ev1.net., who is in charge of the 111.11.111.in-addr.arpa. zone.


Any thoughts.....your help is greatly appreciated

send a trouble ticket to rackshack where you ask them to make a ptr do the hostname/domain on your server.. then you will get rid of that message. Did it with two of my servers one week ago.. now I don't get that warning anymore

which hostname do I use? The server hostname or the domain I wish have resolve?
I chose the hostname

hostname.domain.com

rather than

domain.com

Any issues you see with this

Thanks for your help

my hostname is sub.domain.com and works with no problems.. use nighthawks program for changing the hostname..you can find it in the howto section

what about my other IP's I use for domain's with dedicated IPs.....
just use the domain name as the reverse lookup in the service ticket?

Sorry if it is a stupid question....my bad

rDNS entries are only required for the servers root IP really - it's used to validate email usually which is the main reason you need the entry in RS DNS. I wouldn't worry about any other domain.

I typically get RS to add my two nameservers IP addresses.

Yes. But it's only needed for you mail ip's I do this as a favor to my clients and it's easy to read output of different apps, since you see the name and not justthe IP.