The MX record points to the server that accepts email for your domain. In order for the Yandex server to handle your email, you need to create an MX record that points to this server.
If you delegated your domain to Yandex servers, the MX record is configured automatically. You can view and edit it in the Yandex.Connect DNS editor.
General instructions for configuring MX records
Log in to your DNS hosting company's control panel.
Remove any existing MX records.
Create a new MX record with the following field values (the field names may differ for different control panels):
Value — “mx.yandex.net.”. The dot at the end of the server name is required if your control panel doesn't add it automatically.
Priority — 10.
If the priority can't be set to “10” in your control panel, set any priority other than 0.
Subdomain name — “@”.
In some control panels, you need to enter the name of your domain instead of the @ symbol (for example, “example.com”). If you aren't able to enter either @ or the domain name, leave this field empty.
If this field is missing in the control panel, you don't need to set it.
Wait for the changes to take effect in the DNS (this may take up to 72 hours).