I just started working for a company that the old admin had placed their own external DNS server on the internet and it has died. He didn't document the server or the setting so I cant recreate. I decided the easiest way to get their web, email, and VPN solution back up was to register with Network Solutions. All is working properly but email which I can send/receive to most companies we work with but there are several domain that I cant send to. It doesn't give me a non-delivery error but Exchange will say after several day that it given up on trying to deliver the message. If I do a DNS report it says the following:
"One or more addresses referenced by MX records do not have a matching reverse DNS entry" and this is what I have registered:
18.104.22.168 has mx.mycompany.com. | 70.xx.xx.10 listed.
22.214.171.124 has mx.mycompany.com. | 70.xx.xx.10 listed.
We had our ISP do a reverse lookup entry which took them four weeks but I still can send email to some domains. Here is the revers DNS lookup;
10.xx.xx.70.in-addr.arpa canonical name = mx.mycompany.com.
Authoritative answers can be found from:
origin = NS81.WORLDNIC.com
mail addr = namehost.WORLDNIC.com
serial = 114041815
refresh = 10800
retry = 3600
expire = 604800
minimum = 3600
I really need to get this fixed and appreciate any input to get this resolved.