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:

  picavolehenza na seznam.cz
    SMTP error from remote mail server after RCPT TO:<picavolehenza na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  belivemeshka na seznam.cz
    SMTP error from remote mail server after RCPT TO:<belivemeshka na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  cccc na seznam.cz
    SMTP error from remote mail server after RCPT TO:<cccc na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  puskana na seznam.cz
    SMTP error from remote mail server after RCPT TO:<puskana na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  marek2456 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<marek2456 na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  littleson na centrum.cz
    SMTP error from remote mail server after end of data:
    host cax.virusfree.cz [5.180.49.35]: 554 5.7.1 <littleson na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist