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A message that you sent could not be delivered to one or more of its
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  gcinekile.khubeka@kzndoe.gov.za
    host securemail-mx2.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<gcinekile.khubeka@kzndoe.gov.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  Gcineka.Matole@ecdpw.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<Gcineka.Matole@ecdpw.gov.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gcinamina.mkhize@kznhealth.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<gcinamina.mkhize@kznhealth.gov.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gchase@wil.ncape.gov.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<gchase@wil.ncape.gov.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gchait@cs.uct.ac.za
    host hotstuff-3.cs.uct.ac.za [137.158.160.143]
    SMTP error from remote mail server after RCPT TO:<gchait@cs.uct.ac.za>:
    550 Unrouteable address
  gci@netactive.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<gci@netactive.co.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gcc@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<gcc@mweb.co.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gcfon@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<gcfon@iafrica.com>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gcc@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<gcc@iafrica.com>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  gchlau001@mail.uct.ac.za
    all hosts for 'mail.uct.ac.za' have been failing for a long time (and retry time not reached)
  gcgrobler@zoology.up.ac.za
    host aspmx.l.google.com [142.251.12.27]
    SMTP error from remote mail server after RCPT TO:<gcgrobler@zoology.up.ac.za>:
    550-5.2.1 The email account that you tried to reach is disabled. Learn more at
    550 5.2.1  https://support.google.com/mail/?p=DisabledUser h129si5271200pgc.465 - gsmtp