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:

  pavlitak na centrum.cz
    SMTP error from remote mail server after RCPT TO:<pavlitak na centrum.cz>:
    host cax.virusfree.cz [5.180.49.35]: 554 5.7.1 <pavlitak na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  fastbreak na centrum.cz
    SMTP error from remote mail server after RCPT TO:<fastbreak na centrum.cz>:
    host cax.virusfree.cz [5.180.49.35]: 554 5.7.1 <fastbreak na centrum.cz>:
    Recipient address rejected: Access denied, user does not exist
  angrynator na seznam.cz
    SMTP error from remote mail server after RCPT TO:<angrynator na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  newman40 na seznam.cz
    SMTP error from remote mail server after RCPT TO:<newman40 na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  milan.venus na seznam.cz
    SMTP error from remote mail server after RCPT TO:<milan.venus na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  xbody na seznam.cz
    SMTP error from remote mail server after RCPT TO:<xbody na seznam.cz>:
    host mx1.seznam.cz [77.75.76.42]: 550 5.1.1 Sorry, no mailbox here by that name.
  fret65fret na gmail.com
    SMTP error from remote mail server after RCPT TO:<fret65fret na gmail.com>:
    host gmail-smtp-in.l.google.com [64.233.167.27]:
    550-5.2.1 The user you are trying to contact is receiving mail at a rate that
    550-5.2.1 prevents additional messages from being delivered. For more
    550-5.2.1 information, please visit
    550 5.2.1  https://support.google.com/mail/?p=ReceivingRatePerm h4si560109wrr.521 - gsmtp