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: keith@fcc.co.za retry timeout exceeded keith@dobsontrans.co.za host mail.dobsontrans.co.za [154.0.164.145] SMTP error from remote mail server after RCPT TO:: 550 Mailbox dobsoimj is unattended" keith@bake.co.za host bake.co.za [109.74.201.20] SMTP error from remote mail server after RCPT TO:: 550 No Such User Here keith@adventours.co.za host dc-883ba81f9754.adventours.co.za [156.38.217.146] SMTP error from remote mail server after RCPT TO:: 550 No Such User Here keith@george.org.za host george-org-za.mail.protection.outlook.com [104.47.9.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT050.eop-EUR03.prod.protection.outlook.com] keith@dunroven.co.za all hosts for 'dunroven.co.za' have been failing for a long time (and retry time not reached) keith@blankcanvas.co.za host securemail-mx1.synaq.com [196.35.198.158] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found