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A message that you sent could not be delivered to one or more of its
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  evansm@legal-aid.co.za
    host pinpoint-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<evansm@legal-aid.co.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
  evandenberg@kbhsp.ncape.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<evandenberg@kbhsp.ncape.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
  evan@www.ridedynamics.co.za
    host www.ridedynamics.co.za [41.185.64.75]
    SMTP error from remote mail server after RCPT TO:<evan@www.ridedynamics.co.za>:
    550-Please turn on SMTP Authentication in your mail client.
    550-omr17.orchid.atmailcloud.com [13.251.245.207]:53162 is not permitted to
    550 relay through this server without authentication.