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:

  jkvincent na centrum.cz
    SMTP error from remote mail server after RCPT TO:<jkvincent na centrum.cz>:
    host cax.virusfree.cz [5.180.49.35]: 554 5.7.1 <jkvincent na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  mmm.pre na seznam.cz
    SMTP error from remote mail server after RCPT TO:<mmm.pre na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  pescadito na email.cz
    SMTP error from remote mail server after RCPT TO:<pescadito na email.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  ondralala58 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<ondralala58 na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  nejez.honza na seznam.cz
    SMTP error from remote mail server after RCPT TO:<nejez.honza na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  greaterheal14 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<greaterheal14 na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  ondrejcak na seznam.cz
    SMTP error from remote mail server after RCPT TO:<ondrejcak na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  asdads na seznam.cz
    SMTP error from remote mail server after RCPT TO:<asdads na seznam.cz>:
    host mx1.seznam.cz [77.75.78.42]: 550 5.1.1 Sorry, no mailbox here by that name.