The website has no contact forms, user accounts or payments. If you write to support@mmx-studio.ru, the studio receives your email address, your name or signature, the message and any attachments.
The purpose is to reply and to discuss collaboration, a vacancy or a project. The legal basis is Article 6(1)(5) of Law No. 152-FZ: you write on your own initiative, and the correspondence is needed to reach an agreement with you. For other letters it is Article 6(1)(7): replying to a letter is a legitimate interest of the studio and does not override your rights.
Letters are kept while they are needed for that purpose. Once it is achieved and no collaboration follows, they are deleted within 30 days. If the correspondence leads to a contract, it is kept as long as the law and the contract require.