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:

  jerryk@transnet.co.za
    host za-smtp-inbound-2.mimecast.co.za [41.74.193.210]
    SMTP error from remote mail server after RCPT TO:<jerryk@transnet.co.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 [orbFgBI6PVGLwRsAokOUBA.za19]
  JerryN@TSHWANE.GOV.ZA
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<JerryN@TSHWANE.GOV.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