Отправляю письмо на электронную почту. Оно не отправляется и выдает ошибку. что делать?

Delivery to the following recipient failed permanently:

gmail@uw.edu.pl

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain uw.edu.pl by smtp.uw.edu.pl. [193.0.97.56].

The error that the other server returned was:
550 5.1.1 : Recipient address rejected: User unknown in relay recipient table

-----Original message -----

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выдает при отправке, что это такое я не знаю. срочно нужна помощь