Mail delivery failed: returning message to sender

[Singnet Mail Delivery System]

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:

  icon.co.zaexports@kohler.co.za
    host mx.spamexperts.com [130.117.53.188]
    SMTP error from remote mail server after RCPT TO:<icon.co.zaexports@kohler.co.za>:
    550 No Such User Here
  icst@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<icst@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  icreateart@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<icreateart@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  icon.co.zahubers@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<icon.co.zahubers@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  icon.co.zaeandgsigns@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<icon.co.zaeandgsigns@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  icoljac@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<icoljac@iafrica.com>:
    550 rejected because recipient verify failed -- user not found
  iconice@eject.co.za
    host mailguard13.neotel.co.za [41.168.131.16]
    SMTP error from remote mail server after RCPT TO:<iconice@eject.co.za>:
    554 5.7.1 <iconice@eject.co.za>: Recipient address rejected:
    Access denied
  ics@siemens.co.za
    all hosts for 'siemens.co.za' have been failing for a long time (and retry time not reached)
  icoetzee@impol.net
    host impol-net.mail.protection.outlook.com [104.47.10.36]
    SMTP error from remote mail server after RCPT TO:<icoetzee@impol.net>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT054.eop-EUR03.prod.protection.outlook.com]
  iclaims@utmspace.edu.my
    host aspmx.l.google.com [74.125.130.27]
    SMTP error from remote mail server after RCPT TO:<iclaims@utmspace.edu.my>:
    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 a17si16382908pff.15 - gsmtp
  ichetty@pan.uzulu.ac.za
    all hosts for 'pan.uzulu.ac.za' have been failing for a long time (and retry time not reached)
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Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 14:44:14 +0800
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