You can access Yandex.Mail via third-part clients, such as Microsoft Outlook, Mozilla Thunderbird or The Bat. To set up a client for your mailbox:
Log in to Yandex.Connect via the web interface at least once, and accept the user agreement.
Go to the Yandex.Mail Help page and follow the guide to set up your client. If your account is linked to the company domain, use your full email address as your login (“firstname.lastname@example.org”).
Ask your company administrator to “enable email domain support” if you see the following message: Unfortunately, you cannot configure access to mail clients from your account.