MX record IP address instead of hostnames

[Phil Mayers]

On 06/07/2011 08:31 PM, Lear, Karen (Evolver) wrote:
> Can anyone tell me why my MX record for the coop-uspto.gov domain are IP
> addresses instead of hostnames?
>
> [klear at dns1 conf]$ nslookup
>

As of right now, that's not what I see:

;; ANSWER SECTION:
coop-uspto.gov.		7200	IN	MX	5 coop-mbxhc-1.coop-uspto.gov.
coop-uspto.gov.		7200	IN	MX	5 coop-mbxhc-0.coop-uspto.gov.