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A message that you sent could not be delivered to one or more of its
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  DeniseW@tshwane.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<DeniseW@tshwane.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
  denmed@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<denmed@mweb.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
  denisetaylor@manx.net
    host mx1-cushag.atmailcloud.com [18.200.186.60]
    SMTP error from remote mail server after pipelined end of data:
    550 msg-202: Rejected as SPAM.
  denisme@dmws.durban.gov.za
    host inbound.durban.gov.za [196.38.7.177]
    SMTP error from remote mail server after RCPT TO:<denisme@dmws.durban.gov.za>:
    550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain