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:

  jayt na centrum.cz
    SMTP error from remote mail server after RCPT TO:<jayt na centrum.cz>:
    host cdx.spamfree.cz [94.242.232.66]: 554 5.7.1 <jayt na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  monkey.b na seznam.cz
    SMTP error from remote mail server after RCPT TO:<monkey.b na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  kamastolia na seznam.cz
    SMTP error from remote mail server after RCPT TO:<kamastolia na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  obamytata na email.cz
    SMTP error from remote mail server after RCPT TO:<obamytata na email.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  radnax na seznam.cz
    SMTP error from remote mail server after RCPT TO:<radnax na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.