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A message that you sent could not be delivered to one or more of its
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  f99novaamsdsp@www.wsanford.com
    host www.wsanford.com [148.72.85.49]
    SMTP error from remote mail server after RCPT TO:<f99novaamsdsp@www.wsanford.com>:
    550-Please turn on SMTP Authentication in your mail client.
    550-omr17.orchid.atmailcloud.com [13.251.245.207]:49416 is not permitted to
    550 relay through this server without authentication.
  faaeza@listonbrewis.co.za
    host mail.listonbrewis.co.za [41.203.18.49]
    SMTP error from remote mail server after RCPT TO:<faaeza@listonbrewis.co.za>:
    550 Unroutable address
  faan.sbvh@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<faan.sbvh@mweb.co.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207
  f_radem@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<f_radem@mweb.co.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207
  f_malan@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<f_malan@mweb.co.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207
  faadiel.williams@Media24.com
    host mx01.naspers.com [152.111.195.100]
    SMTP error from remote mail server after RCPT TO:<faadiel.williams@Media24.com>:
    550 Rule imposed as mauve-patches@sourceware.org is blacklisted on Trustwave Email IP Reputation Service - see rbladmin.trustwave.com/?ip=13.251.245.207
  f88613omn85sd31qfw4t1@cloakmymail.com
    host spam1.internet-authority.net [197.189.207.154]
    SMTP error from remote mail server after RCPT TO:<f88613omn85sd31qfw4t1@cloakmymail.com>:
    554 5.7.1 Service unavailable; Client host [13.251.245.207] blocked using b.barracudacentral.org; http://www.barracudanetworks.com/reputation/?pr=1&ip=13.251.245.207
  f99h3562@campus.ru.ac.za
    host mx.ru.ac.za [146.231.128.53]
    SMTP error from remote mail server after RCPT TO:<f99h3562@campus.ru.ac.za>:
    550 Invalid Rhodes University e-mail address:
    f99h3562@campus.ru.ac.za
  fa163@service.netease.com
    host jp.service.netease.com [18.181.121.63]
    SMTP error from remote mail server after RCPT TO:<fa163@service.netease.com>:
    550 User suspended: fa163@service.netease.com
  fa939653ad@giraffe.ru.ac.za
    all hosts for 'giraffe.ru.ac.za' have been failing for a long time (and retry time not reached)