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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:

  accounts@customersupport.co.za
    host mail.customersupport.co.za [197.242.144.138]
    SMTP error from remote mail server after RCPT TO:<accounts@customersupport.co.za>:
    550-Please turn on SMTP Authentication in your mail client, or login to the
    550-IMAP/POP3 server before sending your message.  omr28.orchid.atmailcloud.com
    550-[13.251.162.251]:57524 is not permitted to relay through this server
    550 without authentication.
  accounts@firefox.com
    host smtp1.mdc1.mozilla.com [63.245.208.103]
    SMTP error from remote mail server after RCPT TO:<accounts@firefox.com>:
    550 5.1.1 <accounts@firefox.com>: Recipient address rejected:
    User unknown in virtual alias table
  accounts@DDL.co.za
    host d214059.a.ess.uk.barracudanetworks.com [18.133.136.187]
    SMTP error from remote mail server after end of data:
    550 permanent failure for one or more recipients (accounts@ddl.co.za:blocked)
  accounts@arrowtrading.co.za
    host gateway.webaware.co.za [129.232.157.135]
    SMTP error from remote mail server after RCPT TO:<accounts@arrowtrading.co.za>:
    550-5.5.1 Server IP 13.251.162.251 listed as abusive. See
    550-http://spamauditor.org/best-practices/ip-reputation/ for more information..
    550 Protection provided by MagicSpam 2.1-16.3 http://www.magicspam.com
  accounts@carline.co.za
    host mail.carline.co.za [144.76.104.232]
    SMTP error from remote mail server after RCPT TO:<accounts@carline.co.za>:
    550 5.1.1 <accounts@carline.co.za>: Recipient address rejected:
    User unknown in virtual alias table
  accounts@biztec.co.za
    host mx.spamexperts.com [149.13.75.27]
    SMTP error from remote mail server after end of data:
    550 High probability of spam
  accounts@beyondplatinum.co.za
    host mx1.zamailgate.com [5.9.244.42]
    SMTP error from remote mail server after end of data:
    550 High probability of spam
  accounts@icardz.biz
    host ALT2.ASPMX.L.GOOGLE.COM [142.250.115.27]
    SMTP error from remote mail server after RCPT TO:<accounts@icardz.biz>:
    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 i23si5225719oto.344 - gsmtp