Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Čtvrtek Říjen 7 13:47:48 CEST 2021

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:

  stumbaker na
    SMTP error from remote mail server after RCPT TO:<stumbaker na>:
    host []: 550 User <stumbaker na> unknown

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