I am using Outlook 360 for the domain e-copon.com. Recently I have been receiving many complaints from many persons that they are not able to send email to me. Sometimes I am getting emails, but most of the times I am not getting emails which is causing a severe concern for our operations.
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:
firstname.lastname@example.org host smtp.secureserver.net [188.8.131.52] SMTP error from remote mail server after RCPT TO:<email@example.com>: 550 5.1.1 <firstname.lastname@example.org> Recipient not found. <http://x.co/irbounce>
From: Mail Delivery Subsystem <email@example.com> Date: 22 March 2018 at 10:00:13 AM GMT+3 To: firstname.lastname@example.org Subject: Delivery Status Notification (Failure)
Address not found Your message wasn't delivered to email@example.com because the address couldn't be found, or is unable to receive mail.
The response from the remote server was: 550 5.1.1 <firstname.lastname@example.org> Recipient not found. <http://x.co/irbounce>