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A message that you sent could not be delivered to one or more of its
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  alastair@decipher.za.com
    host mail.decipher.za.com [196.40.97.157]
    SMTP error from remote mail server after RCPT TO:<alastair@decipher.za.com>:
    550 Unroutable address
  alauds@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<alauds@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
  alastairmac@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<alastairmac@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
  alasme@mhs.kzn.school.za
    host mxc02.mxrc.co.za [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<alasme@mhs.kzn.school.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