Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Úterý Říjen 5 21:21:18 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:

  vivien_koneal na
    SMTP error from remote mail server after RCPT TO:<vivien_koneal na>:
    host []: 554 5.7.1 <vivien_koneal na>:
    Recipient address rejected: Access denied, user does not exist

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