This plugin gives you the easiest way to send emails through the Yandex SMTP server instead of PHP mail().

This plugin requires at least PHP 5.4 and PHP mod_ssl to be enabled

1. Upload yandex-mail to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Configure in Settings > Yandex Mail

Yandex Mail Settings Page