MX record IP address instead of hostnames

Lear, Karen (Evolver) Karen.Lear at USPTO.GOV
Tue Jun 7 19:31:52 UTC 2011

Can anyone tell me why my MX record for the domain are IP addresses instead of hostnames?

[klear at dns1 conf]$ nslookup
> set type=mx

Non-authoritative answer:  mail exchanger = 5  mail exchanger = 5

Authoritative answers can be found from:  nameserver =     internet address =

Here is the zone file for
[klear at dr-coopdns-1 named]$ more
$TTL 7200
@       IN      SOA (
                2011060708      ; serial number yyyy/mm/dd/## format
                10800           ; refresh after 3 hour
                3600            ; retry after 1 hour
                604800          ; expire after 1 week
                86400   )       ; minimum TTL 1 day

        IN      NS

localhost       IN      A
dr-coopdns-1    IN      A
dr-idns-1       IN      A

;COOP-USPTO MX record IN      MX      5
;coop-mbxhc-0    IN      MX     5
;coop-mbxhc-1    IN      MX     5 IN      MX      5
mailer          IN      A

www             IN      A
@             IN      A
coop-uspto-srv1 IN      A
coop-dc-0       IN      A
coop-dc-1       IN      A
coop-mbxhc-0    IN      A
webmail         IN      A
webmail         IN      A
autodiscover     IN     A
autodiscover     IN     A
coop-mbxhc-1    IN      A

Karen Lear
Evolver EUS - Network Operations
Phone:  571-272-5314
email:   karen.lear at

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