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A message that you sent could not be delivered to one or more of its
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  khalid@innovate.co.za
    host mail.innovate.co.za [197.221.2.28]
    SMTP error from remote mail server after RCPT TO:<khalid@innovate.co.za>:
    550 Unroutable address
  khaled.d@man-sa.co.za
    host mxc01.mxrc.co.za [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<khaled.d@man-sa.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
  khalagadi@yebo.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<khalagadi@yebo.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
  khalid12@qatar.net.qa
    host mail.qatar.net.qa [82.148.101.101]
    SMTP error from remote mail server after RCPT TO:<khalid12@qatar.net.qa>:
    550 5.1.1 rasCmls42EWf2rasCmTqyc Recipient Rejected [503]
  khadir@dteea.fs.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<khadir@dteea.fs.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
  khali@premierfreight.co.za
    all hosts for 'premierfreight.co.za' have been failing for a long time (and retry time not reached)
  khahliso.sabasaba@treasury.gov.za
    host treasury-gov-za.mail.protection.outlook.com [104.47.9.36]
    SMTP error from remote mail server after RCPT TO:<khahliso.sabasaba@treasury.gov.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT013.eop-EUR03.prod.protection.outlook.com]