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:

  hornew@its.uct.ac.za
    host za-smtp-inbound-1.mimecast.co.za [41.74.197.201]
    SMTP error from remote mail server after RCPT TO:<hornew@its.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 [sitQ1Ci3Pxi19DzWXMQ6UA.za44]
  hopkins2@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<hopkins2@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
  hopikrsnas@mailcity.com
    host mx.lycos.com.cust.b.hostedemail.com [64.98.36.4]
    SMTP error from remote mail server after RCPT TO:<hopikrsnas@mailcity.com>:
    554 5.7.1 <hopikrsnas@mailcity.com>: Recipient address rejected:
    user hopikrsnas@mailcity.com does not exist