I am slightly confused as to what has to go in the rDNS settings of my IP.
Consider the following scenario:
IP: 1.2.3.4
Domain 1: foo1.bar
@ A 1.2.3.4
@ MX mail.foo1.bar
www CNAME @
mail CNAME @
Domain 2: foo2.bar
@ A 1.2.3.4
@ MX mail.foo1.bar
Domain 3: foo3.bar
@ A 1.2.3.4
@ MX mail.foo1.bar
Mails have the format [email protected], [email protected], etc. Postfix is set to identify itself as mail.foo1.bar.
What would be the correct rDNS entry for my IP? foo1.bar? mail.foo1.bar?