Mail for Domain API
Mail for Domain is a free service that allows you to use Yandex.Mail on your own domain. Your users get mailboxes with addresses like name@yourdomain.ru, but you don’t need to spend resources on supporting a mail server. Use the Mail for Domain API to connect domains to Yandex.Mail or disconnect them, manage mailboxes and mailing lists, import email to Yandex servers, and administer your domain.