2019-09-18 03:22:48 1iAQYD-0000Ap-2K ** xxxxxx@gmail.com 
R=dnslookup_relay_to_domains T=remote_smtp: SMTP error from remote mail 
server after end of data: host gmail-smtp-in.l.google.com [74.125.203.27]: 
550-5.7.1 [159.138.58.40] The IP address sending this message does not have 
a\n550-5.7.1 PTR record setup. As a policy, Gmail does not accept messages
 from\n550-5.7.1 IPs with missing PTR records. Please visit\n550-5.7.1  
https://support.google.com/mail/answer/81126#authentication for more\n550 
5.7.1 information. i24si3205050pgi.56 - gsmtp