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A message that you sent could not be delivered to one or more of its
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  ijr@grove.uct.ac.za
    host corpmx.tiscali.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<ijr@grove.uct.ac.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207
  ijprinsloo@gk.up.ac.za
    host alt2.aspmx.l.google.com [142.250.115.27]
    SMTP error from remote mail server after RCPT TO:<ijprinsloo@gk.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 v19si13477387otk.52 - gsmtp
  iicdpta@icd.pwv.gov.za
    host securemail-mx2.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<iicdpta@icd.pwv.gov.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207