To authorize Yandex to send emails on your behalf you will have to include it in your SPF record. The SPF record mechanism used for Yandex is shown below.

include:_spf.yandex.net

For more information on SPF set up for Yandex please click on the button below.

For information on how to set up DKIM please click on the button below.

Create a free OnDMARC account to test your configuration.