You can confirm alternate email addresses so that you will be able to use them to restore access to your Yandex account. If you forgot your password, you can enter your confirmed address and get an email with instructions.
If you confirm your email address, Yandex.Passport will not ask you a security question when you need to restore access, and will instead offer to send you an email with the restore code immediately.
Click Add. Yandex will send an email to this address with a confirmation link.
Enter your main Yandex account password and click Confirm.
The new address will show the confirmed status in your list of email addresses.