Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Neděle Srpen 29 21:57:51 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:

  kyselka na
    SMTP error from remote mail server after RCPT TO:<kyselka na>:
    host []:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) []

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