Confusion over what reverse DNS applies to and where it gets set... Although there are answers on how to do this, I still cannot determine what needs to get done and why.
A domain is registered at Registrar A, which holds the DNS tables. Registrar A also serves up mail services via the Registrar's owned domain. Two VPS serve different 3rd level domain services.
The spf record in DNS table points to the domain of the mail server for MX services, while the MX record points to
mail.registeredDomain.com v=spf1 a mx ptr include:mailServer.net ~all
MX toolbox states
Reverse DNS does not match SMTP Banner
are reverse DNS lookups based on the service (mx) or the domain? I can see the mismatch with MX record, but the mail provider had instructions to set up PTR record as stated.
How should the SPF PTR record be set? and why?