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A message that you sent could not be delivered to one or more of its
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  deez@worldonline.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<deez@worldonline.co.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  deetlefsm@edu.fs.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<deetlefsm@edu.fs.gov.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  deevy@idasa.org.za
    all hosts for 'idasa.org.za' have been failing for a long time (and retry time not reached)