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A message that you sent could not be delivered to one or more of its
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  deovan@sggs.wcape.school.za
    host pop3.netpoint.co.za [129.232.239.20]
    SMTP error from remote mail server after RCPT TO:<deovan@sggs.wcape.school.za>:
    554 5.7.1 <deovan@sggs.wcape.school.za>: Relay access denied
  deonpg@icloud.com
    host mx01.mail.icloud.com [17.57.154.23]
    SMTP error from remote mail server after RCPT TO:<deonpg@icloud.com>:
    552 5.2.2 <deonpg@icloud.com>: user is over quota
  deonmorris@vodamail.co.za
    host mx1.vodamail.co.za [196.11.146.148]
    SMTP error from remote mail server after RCPT TO:<deonmorris@vodamail.co.za>:
    550 5.1.1 <deonmorris@vodamail.co.za>: Recipient address rejected:
    User unknown in local recipient table
  deons@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<deons@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  deonf76@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<deonf76@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  deonet@icon.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<deonet@icon.co.za>:
    550 rejected because recipient verify failed -- user not found
  deon_kay@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<deon_kay@iafrica.com>:
    550 rejected because recipient verify failed -- user not found
  deon_lagrange@symantec.com
    host cluster4.us.messagelabs.com [67.219.250.107]
    SMTP error from remote mail server after end of data:
    553-Message filtered. Refer to the Troubleshooting page at
    553-https://knowledge.broadcom.com/external/article?legacyId
    553 =TECH246726 for more information. (#5.7.1)
  Deon.steyn@up.ac.za
    host aspmx.l.google.com [172.253.118.27]
    SMTP error from remote mail server after RCPT TO:<Deon.steyn@up.ac.za>:
    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 g1si17306211pji.56 - gsmtp