To find the email address of a teacher, navigate the school's website and look for a faculty, staff or directory page. The teaching staff's emails may be organized according to subject taught. The exact process varies depending on the particular school and the organization of its website.
Most schools, particularly high schools and colleges, have websites that offer directories with the email addresses and contact information of their faculty and staff. Larger universities often have searchable directories that contain the email addresses of both teachers and students. They may also offer profiles of their teachers along with their CV's, past teaching experience and past publications.