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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:

  IsabelA@nedcor.co.za
    host mxgw06.nedbank.co.za [168.142.192.40]
    SMTP error from remote mail server after DATA:
    550 #5.7.1 Your access to submit messages to this e-mail system has been rejected.
  isaanddenton@clear.net.nz
    host vfnzmx.iqhive.com [203.118.158.241]
    SMTP error from remote mail server after RCPT TO:<isaanddenton@clear.net.nz>:
    550 5.1.1 <isaanddenton@clear.net.nz>: Recipient address rejected:
    User unknown in virtual mailbox table
  Isabel.Smit@smec.com
    host mxb-002b5b01.gslb.pphosted.com [148.163.154.191]
    SMTP error from remote mail server after RCPT TO:<Isabel.Smit@smec.com>:
    550 5.1.1 User Unknown
  Isabel.Mpe@za.mcd.com
    host mxb-0038a101.gslb.pphosted.com [148.163.133.75]
    SMTP error from remote mail server after RCPT TO:<Isabel.Mpe@za.mcd.com>:
    550 5.1.1 User Unknown
  isabel.debeer@lafarge.com
    host aspmx.l.google.com [172.217.194.26]
    SMTP error from remote mail server after RCPT TO:<isabel.debeer@lafarge.com>:
    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 o196si16954202pfg.375 - gsmtp
  IsaacHlapanf@flysaa.com
    host za-smtp-inbound-1.mimecast.co.za [41.74.193.201]
    SMTP error from remote mail server after RCPT TO:<IsaacHlapanf@flysaa.com>:
    550 Invalid Recipient - https://community.mimecast.com/docs/DOC-1369#550 [0oSxS9wYP9qJojbHZ6o5tQ.za73]
  isabel@achonedtube.co.za
    host mx1.achonedtube.co.za [129.232.151.66]
    SMTP error from remote mail server after RCPT TO:<isabel@achonedtube.co.za>:
    550 Server IP 13.251.164.127 listed as abusive. See http://spamauditor.org/best-practices/ip-reputation/ for more information. Protection provided by MagicSpam 2.0.3-3.1 http://www.magicspam.com
  isaacm@sascoc.co.za
    host sascoc-co-za.mail.protection.outlook.com [104.47.19.110]
    SMTP error from remote mail server after RCPT TO:<isaacm@sascoc.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [JN2ZAF01FT901.eop-zaf01.prod.protection.outlook.com]
  isaacn@sandown.co.za
    host two.mail-in.daimler.com [141.113.8.25]
    SMTP error from remote mail server after RCPT TO:<isaacn@sandown.co.za>:
    550 #5.1.0 Address rejected.
  isaacmotsepe@ub.absa.co.za
    all hosts for 'ub.absa.co.za' have been failing for a long time (and retry time not reached)