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A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  kovlang@brabys.co.za
    host guardian.brabys.co.za [196.216.215.59]
    SMTP error from remote mail server after RCPT TO:<kovlang@brabys.co.za>:
    550 5.1.1 <kovlang@brabys.co.za>: Recipient address rejected:
    User unknown in virtual mailbox table
  kotzi@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kotzi@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
  KOTZENHOME@MWEB.CO.ZA
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<KOTZENHOME@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
  kotzj@doh.ofs.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kotzj@doh.ofs.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
  kotze@mtnloaded.co.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kotze@mtnloaded.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
  kotok@saps.org.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kotok@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
  kotoanem@tlga.kzntl.gov.za
    host securemail-mx2.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kotoanem@tlga.kzntl.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
  kouhar2k@msn.com
    host msn-com.olc.protection.outlook.com [104.47.17.97]
    SMTP error from remote mail server after RCPT TO:<kouhar2k@msn.com>:
    550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302).
  kotto@bader.co.za
    host mail.bader-leather.jp [217.6.217.156]
    SMTP error from remote mail server after RCPT TO:<kotto@bader.co.za>:
    550 Relay not permitted
  kotzea@siemens.co.za
    all hosts for 'siemens.co.za' have been failing for a long time (and retry time not reached)