Sorry if this has been asked before, but I didn't find an answer to this question, I've 2 servers: djondb.com and taskgeo.com, both domains hosted in the same machine, and same ip address, the dns records "A" work well and resolve properly to each server, now the djondb.com uses google as email service and the server taskgeo.com is using postfix/spamassassin/etc to configure a local mail server. (This is due to a limitation on the number of free accounts provided by google), now the question is around the configuration of the reverse dns, in godaddy I've 2 domains, in the djondb.com I put all the mx and ptr records suggested by google and that works well, on the taskgeo.com I created the following TXT/PTR record:
v=spf1 a mx ptr ptr:220.127.116.11 ~all
somehow the service https://www.whatsmydns.net/#PTR/18.104.22.168/email.taskgeo.com to check the reverse dns, keeps jumping from the original name of the machine ns3280134.ip-5-39-93.eu assigned by the host provider and the real name of the server (taskgeo.com), I checked every 5 mins and the servers from New York (to name just 1) changes from email.taskgeo.com to ns3280134.ip-5-39-93.eu, and back to email.taskgeo.com I'm not sure if this is a refresh problem of the dns and it will become stable in a few days or if there's a ptr pointing somewhere that is forcing the dns to change the name assigned to the IP. something like: PTR record in djondb.com is pointing to something wrong and PTR record in xyz.com is pointing to something right, therefore they keep stepping into each other toes.
Maybe you figured this one out, but I'm not an expert on DNS, and mainly I'm trying to figure out this reading a lot of different posts, but I'm completely lost on what I'm doing and I'll appreciate any suggestions to point me in the right direction.
basically what I want to know is, having 2 different domains on the same machine, with the same ip address, is this PTR record "v=spf1 a mx ptr ptr:22.214.171.124 ~all" in the server taskgeo.com right? should they match (djondb.com and taskgeo.com) the same value in both domains configuration?
How do I trace what is wrong with the above configuration?
Thanks in advance.