Yes, mwarner.org can receive emails.
No, mwarner.org 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
107.180.41.83
MX records
mail.mailinator.com
23.239.11.30
smtp.secureserver.net
68.178.213.203