No, jb73bq0savfcp7kl8q0.ga cannot receive emails because it has neither an A record nor MX records.
No, jb73bq0savfcp7kl8q0.ga 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
None
MX records
None