The recipient's account has been blocked due to User Agreement violations
If you sent a message to a Yandex address and received a non-delivery report that reads: “Policy rejection on the target address”, this means that your message recipient's account has been blocked because of User agreement violations.
Try contacting the recipient by another method and report the problem.
If you are the owner of the address to which the message has been sent, you can unblock it yourself. Fill in accurate information about yourself on the Personal information page and you will be unblocked after a while. If you have provided accurate information but weren't unblocked, please contact our support team via the feedback form at the bottom of the page.