Yes, 20mail.in can receive emails.
No, 20mail.in 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
mx37.m1bp.com
198.133.158.252
mx37.mb5p.com
198.133.158.249