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: jellytot@stmichaels.fs.school.za host relay2.ncc.co.za [102.132.9.27] SMTP error from remote mail server after RCPT TO:: 554 5.7.1 E-mail firewall rules determined that 13.251.162.251 is not allowed to send e-mail to (*)jellytot@stmichaels.fs.school.za. jemaine.stevens@gmail.com host gmail-smtp-in.l.google.com [172.217.194.26] SMTP error from remote mail server after RCPT TO:: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser k9si9112081pff.209 - gsmtp jem@manikingames.com all hosts for 'manikingames.com' have been failing for a long time (and retry time not reached)