I have two servers with IP as follows:
ServerA IP 18.104.22.168 is production ServerB IP 22.214.171.124 is development and testing (QA/Staging to be built)
ServerA has A record and ReverseDNS setup for example.com, ServerA has CNAME records for www, foo and bar which each point to example.com
I expect to set up ServerB's DNS entries to be identical to ServerA's entries -- except domain name would be dev.example.com. and www.dev.example.com, foo.dev.example.com and bar.dev.example.com resolve to ServerB's IP.
In particular, I want ServerB hosted apps to be able to send mail that won't be generally rejected by most mail servers due to questionable DNS setup
I suspect that this setup may not pass muster -- is it valid for ServerA example.com DNS not to make reference to the subdomain dev.example.com?
Will mailservers accept mail from host dev.example.com if the reverse DNS matches the IP for dev.example.com, even if example.com has no DNS entries related to dev subdomain?