Mail delivery failed: returning message to sender

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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:

  carmen.streck@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<carmen.streck@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
  Carmen.Scholtz@labour.gov.za
    host securemail-mx2.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<Carmen.Scholtz@labour.gov.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
  carmen.zaffarano@edelman.com
    host edelman-com.mail.protection.outlook.com [104.47.55.138]
    SMTP error from remote mail server after RCPT TO:<carmen.zaffarano@edelman.com>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [BN8NAM12FT011.eop-nam12.prod.protection.outlook.com]
  carmen@groupfin.sbic.co.za
    all hosts for 'groupfin.sbic.co.za' have been failing for a long time (and retry time not reached)
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