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A message that you sent could not be delivered to one or more of its
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  alebotse@nwpg.gov.za
    host mail1.nwpg.gov.za [196.15.218.221]
    SMTP error from remote mail server after RCPT TO:<alebotse@nwpg.gov.za>:
    550 5.1.1 <alebotse@nwpg.gov.za>: Recipient address rejected:
    undeliverable address: Access denied
  alecm@socdev.fs.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<alecm@socdev.fs.gov.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  alec@polka.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<alec@polka.co.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  alectiarandley@ub.absa.co.za
    all hosts for 'ub.absa.co.za' have been failing for a long time (and retry time not reached)