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A message that you sent could not be delivered to one or more of its
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  gas@falsebay.co.za
    host mail.falsebay.co.za [197.221.14.236]
    SMTP error from remote mail server after RCPT TO:<gas@falsebay.co.za>:
    550 Unroutable address
  garymt@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<garymt@mweb.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
  garymcd@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<garymcd@mweb.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
  gasjnb@greenafrica.co.za
    host greenafrica-co-za.mail.protection.outlook.com [104.47.8.36]
    SMTP error from remote mail server after RCPT TO:<gasjnb@greenafrica.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [AM5EUR03FT045.eop-EUR03.prod.protection.outlook.com]