Reverse DNS Lookup Keeps Failing

[giganet]

I have been using DNSStuff's DNS Report tool and no matter what I try I continue to receive FAIL on 'Reverse DNS Lookup'.
No matter what I have tried the result is always 'no reverse DNS (PTR) entries'.

I look in at 'pri.152.169.72.in-addr.arpa' and it seems right?

$TTL        86400
@               IN      SOA     www.giganetwireless.com. hostmaster.giganetwireless.com. (
                                2007090803       ; serial, todays date + todays serial #
                                28800   ; Refresh
                                7200    ; Retry
                                604800  ; Expire
                                86400)  ; Minimum TTL
                        NS      www.giganetwireless.com.
                        NS      www.giganetwireless.com.
211       PTR     giganetwireless.com.
211       PTR     www.giganetwireless.com.
211       PTR     webmail.giganetwireless.com.
210       PTR     login.giganetwireless.com.
211       PTR     mail.giganetwireless.com.
211       PTR     mail.giganetwireless.com.giganetwireless.com.
211       PTR     darlenes-homes.com.
211       PTR     www.darlenes-homes.com.
211       PTR     highcountryhomesofanza.com.
211       PTR     www.highcountryhomesofanza.com.
211       PTR     mail.highcountryhomesofanza.com.

When running 'dig @72.169.152.211 any giganetwireless.com' an MX wouldn't show up until I added the record '211 PTR mail.giganetwireless.com.giganetwireless.com.'

I use DNSExit service and have added the MX, A for email...

Can someone help shed a little light on my errors?

Thank you

Regards