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A message that you sent could not be delivered to one or more of its
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  densta@sggs.wcape.school.za
    host pop3.netpoint.co.za [129.232.239.20]
    SMTP error from remote mail server after RCPT TO:<densta@sggs.wcape.school.za>:
    554 5.7.1 <densta@sggs.wcape.school.za>: Relay access denied
  dennism@matrixnet.co.za
    host mail.matrixnet.co.za [196.41.123.212]
    SMTP error from remote mail server after RCPT TO:<dennism@matrixnet.co.za>:
    550 No Such User Here"
  dent_man@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<dent_man@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  dennispdp@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<dennispdp@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  dentist@cybersmart.co.za
    host mail1.mx.cybersmart.co.za [196.41.124.80]
    SMTP error from remote mail server after RCPT TO:<dentist@cybersmart.co.za>:
    550 5.7.1 <dentist@cybersmart.co.za>: Recipient address rejected:
    Access denied
  dennismaloka@gmail.com
    host gmail-smtp-in.l.google.com [74.125.130.27]
    SMTP error from remote mail server after RCPT TO:<dennismaloka@gmail.com>:
    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 y11si6735533pgo.877 - gsmtp