Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Neděle Srpen 15 01:42:12 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:

  hiroshimiahita na
    SMTP error from remote mail server after RCPT TO:<hiroshimiahita na>:
    host []: 550 5.1.1 <hiroshimiahita na>:
    Recipient address rejected: User unknown in local recipient table
  cz_paja na
    SMTP error from remote mail server after MAIL FROM:<linux na> SIZE=4691:
    host []:
    550 5.7.1 Unfortunately, messages from [] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to []

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