Mail delivery failed: returning message to sender
Mail Delivery System
Mailer-Daemon na orange.es
Sobota Září 4 06:46:22 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:
mondy na sms.cz
SMTP error from remote mail server after RCPT TO:<mondy na sms.cz>:
host mxmailserver.sms.cz [89.29.94.140]: 550 User <mondy na sms.cz> unknown
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