Mail delivery failed: returning message to sender

[Mail Delivery System]

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:

  jedlicka.miloslav na tiscali.cz
    SMTP error from remote mail server after end of data:
    host tax.virusfree.cz [31.7.241.27]: 554 message refused (#5.7.1) - for more information visit https://www.virusfree.cz/cs/help
  kopecky.ales na centrum.cz
    SMTP error from remote mail server after RCPT TO:<kopecky.ales na centrum.cz>:
    host ccx.spamfree.cz [195.24.76.171]: 554 5.7.1 <kopecky.ales na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  tuzning na centrum.cz
    SMTP error from remote mail server after RCPT TO:<tuzning na centrum.cz>:
    host ccx.spamfree.cz [195.24.76.171]: 554 5.7.1 <tuzning na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  lalacekoli na seznam.cz
    SMTP error from remote mail server after RCPT TO:<lalacekoli na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  picovina123 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<picovina123 na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  witcher.geralt na seznam.cz
    SMTP error from remote mail server after RCPT TO:<witcher.geralt na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  davidkulik na email.cz
    SMTP error from remote mail server after RCPT TO:<davidkulik na email.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  solution.time na seznam.cz
    SMTP error from remote mail server after RCPT TO:<solution.time na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.