Job Recruitment Website - Ranking of immigration countries - What is the mailbox of uscis in the United States?

What is the mailbox of uscis in the United States?

Office of the Embassy of the US Citizenship and Immigration Administration in Beijing E-mail:

DHSBeijing.cis@uscis.dhs.gov

This email address is used by American citizens in China and citizens of other countries to consult about immigration and visas.