Postfix & Google "PTR record setup, or the corresponding forward DNS entry does not" | Linux For All | Page 1

Hi, i have error this and dont know how to fix it i google it but i dont got an answer for that, my mail server is self hosted at home and i have dynamic IP, what i need to do?
Diagnostic-Code: smtp; 550-5.7.25 [x.xx.xxx.xxx] The IP address sending this
message does not have a 550-5.7.25 PTR record setup, or the corresponding
forward DNS entry does not 550-5.7.25 point to the sending IP. As a policy,
Gmail does not accept messages 550-5.7.25 from IPs with missing PTR
records. For more information, go to 550-5.7.25
https://support.google.com/mail/answer/81126#ip-practices 550-5.7.25 To
learn more about Gmail's sender policy, go to 550 5.7.25
https://support.google.com/mail/answer/81126.
q27-20020a170906145b00b00a4e5860e488si13761610ejc.741 - gsmtp

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#Postfix & Google "PTR record setup, or the corresponding forward DNS entry does not"