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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:

  cassie@spraytechsa.co.za
    host mail-gateway.imaginet.co.za [41.78.29.100]
    SMTP error from remote mail server after RCPT TO:<cassie@spraytechsa.co.za>:
    550 5.7.1 Service unavailable; client [13.251.245.207] blocked using b.barracudacentral.org
  cassimg@mail.wits.sair.co.za
    host mail.wits.sair.co.za [197.242.159.225]
    SMTP error from remote mail server after RCPT TO:<cassimg@mail.wits.sair.co.za>:
    550-The mail server could not deliver mail to cassimg@mail.wits.sair.co.za.
    550-The account or domain may not exist, they may be blacklisted, or missing
    550 the proper dns entries.
  cassimj@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cassimj@mweb.co.za>:
    550-rejected because 13.251.245.207 is in a black list at
    550-b.barracudacentral.org
    550 http://www.barracudanetworks.com/reputation/?pr=1&ip=13.251.245.207
  cassftthomf@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cassftthomf@iafrica.com>:
    550-rejected because 13.251.245.207 is in a black list at
    550-b.barracudacentral.org
    550 http://www.barracudanetworks.com/reputation/?pr=1&ip=13.251.245.207
  cassievanzyl@nashuaisp.co.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<cassievanzyl@nashuaisp.co.za>:
    550-rejected because 13.251.245.207 is in a black list at
    550-b.barracudacentral.org
    550 http://www.barracudanetworks.com/reputation/?pr=1&ip=13.251.245.207
  CassimA@discovery.co.za
    host za-mx.discovery.co.za [196.6.208.53]
    SMTP error from remote mail server after RCPT TO:<CassimA@discovery.co.za>:
    550 #5.1.0 Address rejected.
  cassins.bil@gmail.com
    host gmail-smtp-in.l.google.com [142.251.12.27]
    SMTP error from remote mail server after RCPT TO:<cassins.bil@gmail.com>:
    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 d8si15931552pls.345 - gsmtp
  cassiembrey@telkom.net
    all hosts for 'telkom.net' have been failing for a long time (and retry time not reached)