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A message that you sent could not be delivered to one or more of its
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  chewal@herschel.wcape.school.za
    host mopani.school.za [197.157.95.68]
    SMTP error from remote mail server after RCPT TO:<chewal@herschel.wcape.school.za>:
    554 5.1.1 <chewal@herschel.wcape.school.za>: Recipient address rejected:
    User unknown in virtual mailbox table
  chewingear@gmail.com
    host gmail-smtp-in.l.google.com [74.125.24.27]
    SMTP error from remote mail server after RCPT TO:<chewingear@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 9si15802700pll.272 - gsmtp
  chewitt@ilink.nis.za
    all relevant MX records point to non-existent hosts