Mail delivery failed: returning message to sender

[Mail Delivery System]

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:

  f058ea4157@iwr.ru.ac.za
    local delivery failed

The following text was generated during the delivery attempt:

------ f058ea4157@iwr.ru.ac.za ------

f058ea4157: Mailbox does not exist
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