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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:

  chipoc@amc-intsa.com
    host amc-intsa.com [192.185.39.31]
    SMTP error from remote mail server after RCPT TO:<chipoc@amc-intsa.com>:
    550 No Such User Here"
  Chipo_Msimanga@dell.com
    host mxa-00154901.gslb.pphosted.com [67.231.157.37]
    SMTP error from remote mail server after RCPT TO:<Chipo_Msimanga@dell.com>:
    550 5.1.1 User Unknown
  chipj@rcn.com
    host mx.rcn.com [69.168.97.77]
    SMTP error from remote mail server after RCPT TO:<chipj@rcn.com>:
    550 5.1.1 [R2] Recipient chipj@rcn.com does not exist here.