I have this problem in Laravel 5.5.44 with Swift Mailer package trying to sending emails. This is the mail that the Swift Mailer package send to the server responsible for sending e-mails to the users:
This is the mail system at host user-ws.localdomain. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <email@example.com>: host gmail-smtp-in.l.google.com[220.127.116.11] said: 550-5.7.1 [41.X.X.X] The IP address sending this message does not have a PTR 550-5.7.1 record setup. As a policy, Gmail does not accept messages from IPs 550-5.7.1 with missing PTR records. Please visit 550-5.7.1 https://support.google.com/mail/answer/81126#authentication for more 550 5.7.1 information. p10-v6si4248809wrw.296 - gsmtp (in reply to end of DATA command)
Can you guys help me?