Yes, in1.biz can receive emails.
No, in1.biz 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
184.168.221.33
MX records
mailstore1.secureserver.net
68.178.213.244
smtp.secureserver.net
68.178.213.37