Delivery Status Notification (Failure) on your mailbox ... 
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Message was not accepted -- invalid mailbox. Local mailbox voznak@mail.ru is unavailable: user not found (state 17).
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