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A message that you sent could not be delivered to one or more of its
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  kasturie.govender@fnbcorporate.co.za
    host mx2.hc858-6.c3s2.iphmx.com [216.71.159.51]
    SMTP error from remote mail server after RCPT TO:<kasturie.govender@fnbcorporate.co.za>:
    550 #5.1.0 Address rejected.
  kasturir@sterkinekor.co.za
    host sterkinekor-com.mail.protection.outlook.com [104.47.8.36]
    SMTP error from remote mail server after RCPT TO:<kasturir@sterkinekor.co.za>:
    550 5.7.64 TenantAttribution; Relay Access Denied [AM5EUR03FT042.eop-EUR03.prod.protection.outlook.com]
  kasturi.thumbusami@dcs.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kasturi.thumbusami@dcs.gov.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
  kaspaasie@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kaspaasie@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
  kasturimar@ialch.co.za
    host mail.ialch.co.za [160.226.155.108]
    SMTP error from remote mail server after RCPT TO:<kasturimar@ialch.co.za>:
    550 5.1.1 <kasturimar@ialch.co.za>... User unknown
  kasmoo@ialch.co.za
    host mail.ialch.co.za [160.226.155.108]
    SMTP error from remote mail server after RCPT TO:<kasmoo@ialch.co.za>:
    550 5.1.1 <kasmoo@ialch.co.za>... User unknown
  kassim.patel@treasury.gov.za
    host treasury-gov-za.mail.protection.outlook.com [104.47.10.36]
    SMTP error from remote mail server after RCPT TO:<kassim.patel@treasury.gov.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT027.eop-EUR03.prod.protection.outlook.com]
  kasongokalabo@gmail.com
    host gmail-smtp-in.l.google.com [142.251.12.27]
    SMTP error from remote mail server after RCPT TO:<kasongokalabo@gmail.com>:
    550-5.1.1 The email account that you tried to reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1  https://support.google.com/mail/?p=NoSuchUser my18si20833430pjb.95 - gsmtp
  kassie.anver@briggs.co.za
    host mail.briggs.co.za [102.130.121.233]
    SMTP error from remote mail server after RCPT TO:<kassie.anver@briggs.co.za>:
    554 5.1.1 <kassie.anver@briggs.co.za>: Recipient address rejected:
    User unknown
  kasparek@sun.co.za
    all hosts for 'sun.co.za' have been failing for a long time (and retry time not reached)