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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:

  alas@wbs.co.za
    host mailguard6.neotel.co.za [41.168.2.5]
    SMTP error from remote mail server after RCPT TO:<alas@wbs.co.za>:
    554 5.7.1 <alas@wbs.co.za>: Recipient address rejected:
    Access denied
  alaska.ramatsetse@up.ac.za
    host aspmx.l.google.com [142.250.4.27]
    SMTP error from remote mail server after RCPT TO:<alaska.ramatsetse@up.ac.za>:
    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 m20si21832070pfk.245 - gsmtp
  alanvc@gecko.biol.wits.ac.za
    all hosts for 'gecko.biol.wits.ac.za' have been failing for a long time (and retry time not reached)