Mail delivery failed: returning message to sender
Mail Delivery System
Mailer-Daemon na orange.es
Úterý Říjen 5 05:08:42 CEST 2021
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:
veverka na sky.cz
SMTP error from remote mail server after RCPT TO:<veverka na sky.cz>:
host mail.sky.cz [193.165.254.8]: 550 5.1.1 <veverka na sky.cz>... User unknown
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