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: forde.p@man-sa.co.za host mxc02.mxrc.co.za [196.35.198.158] SMTP error from remote mail server after RCPT TO:: 550 relay not permitted forcek@dbn.caxton.co.za host za-smtp-inbound-1.mimecast.co.za [41.74.197.210] SMTP error from remote mail server after RCPT TO:: 550 Invalid Recipient - https://community.mimecast.com/docs/DOC-1369#550 [y4EKj-JyP1q0ytAXnR2fvA.za70] forcal03@rghs.wcape.school.za all hosts for 'rghs.wcape.school.za' have been failing for a long time (and retry time not reached)