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: gabukabooi@playhousecompany.com host za-smtp-inbound-2.mimecast.co.za [41.74.193.201] SMTP error from remote mail server after RCPT TO:: 550 Invalid Recipient - https://community.mimecast.com/docs/DOC-1369#550 [LvjumE5NPBibD_osPWrytA.za105] gabriel.fhisol@gamil.com host mail.gamil.com [192.252.154.117] SMTP error from remote mail server after RCPT TO:: 511 sorry, no mailbox here by that name (#5.1.1 - chkuser)