https://domain.yandex.com/domains_add/
Use Yandex.Mail for your domain free of charge for effective communication between the employees of your organization.
At your disposal
Required number of mailboxes (by default 1,000, to get more, contact our Support Service)
A convenient interface for managing mail accounts (blocking mailboxes of dismissed and the creation of mailboxes for new employees, changing passwords, etc.)
You can use your organization's logo in the Mail's web interface.
Also
Unlimited-size mailbox
Reliable anti-spam and virus system
Access to mail through the web interface (from any computer) and mail programs using POP3/IMAP protocols
Access to mail from mobile devices
A calendar for organizing your work day, scheduling meetings, and creating a to-do list
Convenient tools for working with messages in the web interface (previewing office documents, downloading all files as one archive, filters and labels for convenient sorting of correspondence, and much else).
Many other capabilities (default address, domain aliases).