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A message that you sent could not be delivered to one or more of its
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  ILOMcARD@CSIR.CO.ZA
    host pta-smg3.csir.co.za [146.64.81.182]
    SMTP error from remote mail server after RCPT TO:<ILOMcARD@CSIR.CO.ZA>:
    550 5.1.1 <ILOMcARD@CSIR.CO.ZA>: Recipient address rejected:
    undeliverable address: host csir-co-za.mail.protection.outlook.com[104.47.6.36] said:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT016.eop-EUR02.prod.protection.outlook.com] (in reply to RCPT TO command)
  ilonka@nupro.co.za
    host relay01.nupro.co.za [41.76.110.132]
    SMTP error from remote mail server after RCPT TO:<ilonka@nupro.co.za>:
    550 5.1.1 <ilonka@nupro.co.za>: Recipient address rejected:
    undeliverable address: Address lookup failed
  illona.clihnaut@sandvik.com
    host sandvik-com.mail.protection.outlook.com [104.47.1.36]
    SMTP error from remote mail server after RCPT TO:<illona.clihnaut@sandvik.com>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR01FT035.eop-EUR01.prod.protection.outlook.com]