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:

  bhbh na wr.cz
    SMTP error from remote mail server after RCPT TO:<bhbh na wr.cz>:
    host mail.wr.cz [93.185.104.5]: 550-rejected because 62.36.20.208 is in a black list at bl.spamcop.net
    550 Blocked - see https://www.spamcop.net/bl.shtml?62.36.20.208