Set up valid reverse DNS records of your sending server IP addresses that point to your domain. Check for a PTR record with the Google Admin Toolbox Dig tool.

1. history

delivery 1595: failure: 74.125.23.26_failed_after_I_sent_the_message./

Remote_host_said:_550-5.7.25_[14.192.44.5]_The_IP_address_sending_this_message_does_not_have_a_PTR/550-5.7.25_record_setup,_or_the_corresponding_forward_DNS_entry_does_not_point/550-5.7.25_to_the_sending_IP._As_a_policy,_Gmail_does_not_accept_messages_from/550-5.7.25_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._e12-20020a17090a77cc00b002a2a9d5430asi9253527pjs.29_-_gsmtp/

5.44.192.14.in-addr.arpa. 86395 IN      CNAME   5.0/27.44.192.14.in-addr.arpa.
5.0/27.44.192.14.in-addr.arpa. 86400 IN PTR     mx.m.qmail.jp.


mx.m.qmail.jp.          3600    IN      CNAME   b.ns.qmail.jp.
b.ns.qmail.jp.          86400   IN      A       157.7.113.173

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