Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Neděle Říjen 10 07:14:18 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:

  gabriela na
    SMTP error from remote mail server after end of data:
    host []: 550-5.7.26 This message does not have authentication information or fails to
    550-5.7.26 pass authentication checks. To best protect our users from spam, the
    550-5.7.26 message has been blocked. Please visit
    550-5.7.26 for more
    550 5.7.26 information. 199si15327845wma.201 - gsmtp

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