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:

  kulkahonza na seznam.cz
    SMTP error from remote mail server after RCPT TO:<kulkahonza na seznam.cz>:
    host mx2.seznam.cz [77.75.76.32]: 550 5.1.1 Sorry, no mailbox here by that name.
  zlatni.teplice na seznam.cz
    SMTP error from remote mail server after RCPT TO:<zlatni.teplice na seznam.cz>:
    host mx2.seznam.cz [77.75.76.32]: 550 5.1.1 Sorry, no mailbox here by that name.
  chrapoun100 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<chrapoun100 na seznam.cz>:
    host mx2.seznam.cz [77.75.76.32]: 550 5.1.1 Sorry, no mailbox here by that name.