Yes, 5717.ru can receive emails.
No, 5717.ru is a throwaway domain and should be blocked.
You can use MailCheck's free API to automatically block throwaway emails. Read our documentation to get started. No registration required.
A record
104.27.151.27
MX record
mail.5717.ru
144.217.200.164
This domain has been found on http://brodilla.email