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:

  a.slavicek na nadeje.cz
    SMTP error from remote mail server after RCPT TO:<a.slavicek na nadeje.cz>:
    host nadeje-cz.mail.protection.outlook.com [104.47.12.36]:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB3EUR04FT035.eop-eur04.prod.protection.outlook.com]
  michal25 na amateri.cz
    SMTP error from remote mail server after RCPT TO:<michal25 na amateri.cz>:
    host aspmx.l.google.com [172.253.120.27]: 550-5.1.1 The email account that you tried to reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1  https://support.google.com/mail/?p=NoSuchUser p22si4471219wma.196 - gsmtp