I have site example.com and I want to set an external mail server m1.example.com , most whitelists like AOL requires reverse DNS for all IPs, but in order to fetch the bounces properly I will be sending mail like this, return path and from being different domains:
return-path [email protected] from: [email protected]
So I am unsure if the reverse DNS of m1 IP should match the m1.example.com or just example.com
Thank you.