SMTP error from remote mail server after end of data:
host gmail-smtp-in.l.google.com [64.233.161.27]: 550-5.7.1 [xx.xxx.xxx.xxx] The IP address sending this message does not have a 550-5.7.1 PTR record setup. As a policy, Gmail does not accept messages from 550-5.7.1 IPs with missing PTR records. Please visit 550-5.7.1 https://support.google.com/mail/answer/81126#authentication for more
SMTP error from remote mail server after end of data:
550 5.7.1 information. d129si35572832lfg.31 - gsmtp