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A message that you sent could not be delivered to one or more of its
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  koketsop@mie.co.za
    host za-smtp-inbound-2.mimecast.co.za [41.74.197.210]
    SMTP error from remote mail server after RCPT TO:<koketsop@mie.co.za>:
    550 Invalid Recipient - https://community.mimecast.com/docs/DOC-1369#550 [EEXjEsrONT-6g93HGzD1Vg.za140]
  kokstadMIC@saps.org.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kokstadMIC@saps.org.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
  kokr@dwaf-wcp.wcape.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kokr@dwaf-wcp.wcape.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
  koldewage@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<koldewage@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
  kokkowiet@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kokkowiet@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
  kokkiekok@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kokkiekok@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
  kokstad@millinglogistics.co.za
    all hosts for 'millinglogistics.co.za' have been failing for a long time (and retry time not reached)
  kokkie@penta-net.co.za
    host mail.penta-net.co.za [129.232.251.198]
    SMTP error from remote mail server after RCPT TO:<kokkie@penta-net.co.za>:
    550 Unroutable address
  KokkieKemp@Eaton.com
    host mail2.eaton.com [192.104.67.3]
    SMTP error from remote mail server after RCPT TO:<KokkieKemp@Eaton.com>:
    554 5.7.1 <KokkieKemp@Eaton.com>: Recipient address rejected:
    Access denied
  Koketso.Montwedi@expresspros.co.za
    host expresspros-co-za.mail.protection.outlook.com [104.47.10.36]
    SMTP error from remote mail server after RCPT TO:<Koketso.Montwedi@expresspros.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT042.eop-EUR03.prod.protection.outlook.com]