Mail on Yandex does not leave today. What does this error mean?

Question

Mail server

I wonder if I only have such a problem or some kind of failure on the Yandex server?

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain yandex.com by mx.yandex.ru. [2a02:6b8::89].
The error that the other server returned was:
550 5.7.1 Policy rejection on the target address

Answer 1

Policy rejection on the target
address