Problem for by pass gmail in server mode

[raatc]

I bypass few service with your script, but it s not work on gmail. i have this error:

[6.20.7.244] 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. Please visit 550-5.7.25 https://support.google.com/mail/answer/81126#ip-practices for more 550 5.7.25 information. uo38-20020a170907cc2600b0087bda90a805si8503852ejc.488 - gsmtp