Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Středa Říjen 6 01:12:17 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:

  david.ubl na
    SMTP error from remote mail server after RCPT TO:<david.ubl na>:
    host []:
    550 5.1.1 User Unknown

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