Yes, national.shitposting.agency can receive emails.
No, national.shitposting.agency 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
52.11.159.5
MX records
mx1.cock.li
185.10.68.5
mx2.cock.li
198.167.223.92