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A message that you sent could not be delivered to one or more of its
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  bmzimba@lantic.net
    host mx.inbound.vox.co.za [41.193.119.123]
    SMTP error from remote mail server after initial connection:
    550 5.5.0 Not allowed.
  bmurray@webmail.co.za
    host mx.wmi2.net [62.210.139.249]
    SMTP error from remote mail server after RCPT TO:<bmurray@webmail.co.za>:
    550 5.1.1 <bmurray@webmail.co.za>: Recipient address rejected:
    User unknown in virtual mailbox table