Yes, 189.cn can receive emails.
No, 189.cn 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
118.85.207.65
MX records
mta-189.21cn.com
183.61.185.69
mx2-189.21cn.com
14.116.139.31
mx3-189.21cn.com
14.116.139.31