Mail delivery failed: returning message to sender

[Singnet Mail Delivery System]

This message was created automatically by mail delivery software.

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:

  coaching.education@safa.net
    host protection-02.dotnetwork.co.za [154.66.66.166]
    SMTP error from remote mail server after end of data:
    550 High probability of spam
  cnundlal@csir.co.za
    host pta-smg4.csir.co.za [146.64.81.183]
    SMTP error from remote mail server after RCPT TO:<cnundlal@csir.co.za>:
    550 5.1.1 <cnundlal@csir.co.za>: Recipient address rejected:
    undeliverable address: host csir-co-za.mail.protection.outlook.com[104.47.4.36] said:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [AM5EUR02FT039.eop-EUR02.prod.protection.outlook.com] (in reply to RCPT TO command)
  coacham@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<coacham@mweb.co.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  cnwred1@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cnwred1@mweb.co.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  cnunes@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cnunes@mweb.co.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  coa-owner@lists.uct.ac.za
    host za-smtp-inbound-2.mimecast.co.za [41.74.193.210]
    SMTP error from remote mail server after RCPT TO:<coa-owner@lists.uct.ac.za>:
    550 sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32. - https://community.mimecast.com/docs/DOC-1369#550 [q2JCJW_PPYesWUtmBlEdLA.za19]
  co@turf-ag.co.za
    host mail.turf-ag.co.za [197.221.10.206]
    SMTP error from remote mail server after RCPT TO:<co@turf-ag.co.za>:
    550 Unroutable address
  cnuns@knysna.gov.za
    host za-smtp-inbound-1.mimecast.co.za [41.74.197.201]
    SMTP error from remote mail server after RCPT TO:<cnuns@knysna.gov.za>:
    550 sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32. - https://community.mimecast.com/docs/DOC-1369#550 [85CMp868Ptq8ho7HqmmxsQ.za120]
  cnunan@vegaschool.com
    host za-smtp-inbound-1.mimecast.co.za [41.74.197.201]
    SMTP error from remote mail server after RCPT TO:<cnunan@vegaschool.com>:
    550 sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32. - https://community.mimecast.com/docs/DOC-1369#550 [85CMp868Ptq8ho7HqmmxsQ.za120]
  cnylock@msn.com
    host msn-com.olc.protection.outlook.com [104.47.73.33]
    SMTP error from remote mail server after RCPT TO:<cnylock@msn.com>:
    550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302).
  cnyo1@student.monash.edu
    host ASPMX.L.GOOGLE.COM [74.125.68.27]
    SMTP error from remote mail server after RCPT TO:<cnyo1@student.monash.edu>:
    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 u23si19491773pgi.207 - gsmtp
  cnyric@mail.uct.ac.za
    all hosts for 'mail.uct.ac.za' have been failing for a long time (and retry time not reached)
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