I am getting these emails about my new server and cant figure out exactly what I need to do to fix it:

IMPORTANT: Do not ignore this email.
The hostname (challenger) resolves to . It should resolve to 209.xxx.xxx.xxx. Please be sure to correct /etc/hosts as well as the 'A' entry in zone file for the domain.

Some are all of these problems can be caused by
/etc/resolv.conf being setup incorrectly. Please check this file if you
believe everything else is correct.

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can anyone help me here?

Make sure you don't have any IPs showing in your resolv.conf

domain f5hosting.com
search f5hosting.com
nameserver 127.0.0.1
nameserver 123.123.123.123

(change 123.123.123.123 to your own nameserver's IP.)

sometimes for unknown reasons,

other DNS gets inputed there for unknown reasons like

nameserver 127.0.0.1
nameserver 123.123.123.123
nameserver 321.321.321.321 <--- where this nameserver IP dont belong to your server.

You have already corrected the entry in /etc/hosts so it contains both an entry
209.x.x.x yourserver.blabla.net servername and
127.0.0.1 localhost.localdomain localhost

ant I assume you already corrected the A record in the zone file?

One more thing :)

You might want to check you /etc/hosts file
and make sure

127.0.0.1 sname localhost.localdomain localhost
123.123.123.123 sname sname.f5hosting.com sname

(change SNAME to the name of urserver alias and change 123.123.123.123 to the IP of your primary DNS Nameserver)

Also check on the db of the dns zone if its only causing problems on a single domain or user.

I get the same e-mail each time I run the cpanel update script.. it says not to ignore it, but I do since nothing on the server has had problems because of it. If it isn't broken.. no need to fix it is how I see it. Basically the reason why I get the e-mail is because I setup a webpage for the server name and it's not on the same IP as the master IP for the server.

Have you had any trouble on the server because of this or do you just want to get rid of these messages?