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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:

  Atlaletsi@nwpg.gov.za
    host mail3.nwpg.gov.za [196.15.218.222]
    SMTP error from remote mail server after RCPT TO:<Atlaletsi@nwpg.gov.za>:
    550 5.1.1 <Atlaletsi@nwpg.gov.za>: Recipient address rejected:
    undeliverable address: Access denied
  atkierr@transhex.co.za
    host transhex-co-za.mail.protection.outlook.com [104.47.19.238]
    SMTP error from remote mail server after RCPT TO:<atkierr@transhex.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [CT2ZAF01FT004.eop-zaf01.prod.protection.outlook.com]
  ATKF.ALL@agrana.com
    host agrana-com.mail.protection.outlook.com [104.47.6.36]
    SMTP error from remote mail server after RCPT TO:<ATKF.ALL@agrana.com>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT040.eop-EUR02.prod.protection.outlook.com]
  ATKBRE003@mail.uct.ac.za
    all hosts for 'mail.uct.ac.za' have been failing for a long time (and retry time not reached)