Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Pátek Srpen 27 01:19:59 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:

  punja99 na
    SMTP error from remote mail server after MAIL FROM:<linux na> SIZE=5259:
    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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