Yes, japan-next.online can receive emails.
No, japan-next.online 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
150.60.232.229
MX records
vlmx20.secure.ne.jp
122.200.253.212
vlmx21.secure.ne.jp
122.200.253.218
vlmx22.secure.ne.jp
122.200.253.217