This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: lindachakwi@gmail.com host gmail-smtp-in.l.google.com [192.178.223.27] SMTP error from remote mail server after end of data: 550-5.7.25 [196.43.100.66] 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 match the sending IP. As a policy, Gmail does not accept messages 550-5.7.25 from IPs with missing PTR records. For more information, go to 550-5.7.25 https://support.google.com/a?p=sender-guidelines-ip 550-5.7.25 To learn more about Gmail requirements for bulk senders, visit 550 5.7.25 https://support.google.com/a?p=sender-guidelines. ffacd0b85a97d-432bd62e517si15392420f8f.504 - gsmtp