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:

  hardnax na centrum.cz
    SMTP error from remote mail server after RCPT TO:<hardnax na centrum.cz>:
    host ccx.spamfree.cz [195.24.76.171]: 554 5.7.1 <hardnax na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  dexter022 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<dexter022 na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  zdrep na seznam.cz
    SMTP error from remote mail server after RCPT TO:<zdrep na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  k.hrosak na post.cz
    SMTP error from remote mail server after RCPT TO:<k.hrosak na post.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  jagjf na seznam.cz
    SMTP error from remote mail server after RCPT TO:<jagjf na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  pitkinac na seznam.cz
    SMTP error from remote mail server after RCPT TO:<pitkinac na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.