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: Dup.dplessis@eskom.co.za host mx1.eskom.seagatestoragecloud.co.za [169.239.240.92] SMTP error from remote mail server after RCPT TO:: 550-Callout verification failed: 550 550 5.1.1 User unknown duppie@duiwelsnek.co.za host mx1.cpmx.co.za [169.239.217.2] SMTP error from remote mail server after end of data: 550 High probability of spam dupreez@bluetrain.co.za host za-smtp-inbound-2.mimecast.co.za [41.74.193.201] SMTP error from remote mail server after end of data: 554 Email rejected due to security policies - https://community.mimecast.com/docs/DOC-1369#554 [U7BiMMtcOaSW-SHHY-35GA.za57] durandtf@mattex.co.za all hosts for 'mattex.co.za' have been failing for a long time (and retry time not reached) dupwest@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found dupreezhc@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found duplesir@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found DUP61@TRUSTNET.CO.ZA host mib.trustnet.co.za [102.221.252.40] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table duns@trustnet.co.za host mib.trustnet.co.za [102.221.252.40] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table dup@cheymaxim.co.za host mx1.tld-mx.com [169.239.218.2] SMTP error from remote mail server after RCPT TO:: 550 No such recipient here