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A message that you sent could not be delivered to one or more of its
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  adeea@gold.up.ac.za
    host aspmx.l.google.com [74.125.24.27]
    SMTP error from remote mail server after RCPT TO:<adeea@gold.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 200si19605259pgg.215 - gsmtp
  addictsw@kahi.com
    host mail.kahi.com [216.218.249.71]
    SMTP error from remote mail server after RCPT TO:<addictsw@kahi.com>:
    550 No such user (addictsw) -ERR addictsw@kahi.com not found
  adebmel@fhshs.wcape.school.za
    host mopani.school.za [197.157.95.68]
    SMTP error from remote mail server after RCPT TO:<adebmel@fhshs.wcape.school.za>:
    554 5.1.1 <adebmel@fhshs.wcape.school.za>: Recipient address rejected:
    User unknown in virtual mailbox table
  addisonw@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<addisonw@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found