How possible is it to recieve mail from US if you live in Guatemala?

All of the major cities and towns have mail service companies that will move mail for you. You will have a mailing address in Miami, for example, and the mail service will carry your mail or packages to or from that US city. There is a fee, of course, and your mail is always a few days late, but it is dependable. Even some of the couriers such as Cargo Express offer regular mail service.