Mail delivery failed: returning message to sender

Mail Delivery System Mailer-Daemon na
Úterý Říjen 19 19:16:31 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:

  konter na
    SMTP error from remote mail server after RCPT TO:<konter na>:
    host []: 554 5.7.1 Service unavailable; Client host [] blocked using; Your e-mail service was detected by (NiX Spam) as spamming at Tue, 19 Oct 2021 11:48:31 +0200. Your admin should visit

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