The problem with sending in recommendations by mail is that you have to look up the mailing address, but it's always a different place on each website, and sometimes it's not even on the website.
So here are some of the college addresses I had to look up:
Office of Admissions and Financial Aid
86 Brattle Street
Cambridge, MA 02138
Boston University Admissions
121 Bay State Road
Boston, MA 02215
Office of Undergraduate Admissions
Medford, MA 02155
Santa Clara University
500 El Camino Real
Santa Clara 95053
Office of Undergraduate Admission.
355 Galvez Street
Stanford, California 94305-6106
Office of Admissions
Massachusetts Institute of Technology
77 Massachusetts Ave.
Cambridge, MA 02139-4307