Emails are failing to one of our customers. The returned email reflects the public ip, but not the host name (smith.com). I'm confident this is reverse dns issue. I need to contact my ISP, but I need some advice before doing so.
Our registed domain smith.hst.com is different from our mail domain which is smith.com.
Our ns1 record, "ns1.smithhst.com" is pointed to 18.104.22.168. This is only an example and not our actual company name or ip address. The referenced public ip is the outside interface of our fatpipe running SmartDNS, but is the ip that reflects in the mail headers on the failed email transmissions. Outgoing internet email goes across our internet T1 out to the internet. All incoming internet email, bound for smith.com, comes back, accross the internet to our corporate headquarters, across our frame connection to our local mail server located inside our network. That local mail server is on the smith.com domain. An example of our email address would be "firstname.lastname@example.org"
Would I setup reverse dns as follows:
22.214.171.124 IN PTR ns1.smithhst.com
I want to make sure that the mail continues to be associated with the smith.com domain.
Currently the ISP is listed as the Primary DNS. At least that's what I noted a few minutes ago when I was doing an automated request for a Reverse DNS change. Perhaps I need to change the primary to our fatpipe. I may also need to create an MX record and point it back to the vestcom domain. I could create a seperate public IP just for the mail server and enter this on the fatipe.