Is it required to register PTR record for all the domains which uses the same IP Address?
We have lot of subsidiary companies which uses a common mail server with their own SMTP domains (Multi tenant) like email@example.com, firstname.lastname@example.org. The MX record of all the companies are pointed to the same IP address (Say 220.127.116.11). I need to register PTR record for the domains. So please guide me is it required to register PTR record for all the MX record which uses the same IP Address?
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