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A message that you sent could not be delivered to one or more of its
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  gouwse@ais.up.ac.za
    host aspmx.l.google.com [142.251.12.26]
    SMTP error from remote mail server after RCPT TO:<gouwse@ais.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 y28si20840338pgl.12 - gsmtp
  gouwsmike@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<gouwsmike@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  gotthard.zaja@t-online.de
    host mx02.t-online.de [194.25.134.9]
    SMTP error from remote mail server after RCPT TO:<gotthard.zaja@t-online.de>:
    550-5.1.1 user unknown
    550 5.1.1 Unknown recipient.
  gouwaconrad@hotmail.com
    host hotmail-com.olc.protection.outlook.com [104.47.2.33]
    SMTP error from remote mail server after RCPT TO:<gouwaconrad@hotmail.com>:
    550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302).
  gounden@schnellecke.co.za
    host vwsaesa1.vwsa.co.za [152.107.142.114]
    SMTP error from remote mail server after RCPT TO:<gounden@schnellecke.co.za>:
    550 #5.1.0 Address rejected.
  gouwa@momsandbabes.co.za
    host aspmx.l.google.com [142.251.12.26]
    SMTP error from remote mail server after RCPT TO:<gouwa@momsandbabes.co.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 m18si25488972plx.21 - gsmtp