I keep getting this warning when I try to send email to gmail.
Thank you for your interest
host gmail-smtp-in.l.google.com[188.8.131.52] said: 550-5.7.25 [184.108.40.206] 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. i18-20020adfded2000000b002fab5c5951bsi10133056wrn.805 - gsmtp (in reply to end of DATA command)