About Mail Box Primary : Mail Box Primary magazine is for teachers grade 2 & 3 covering areas such as problem-solving skills, grammar, history, basic chemistry, animal sciences, and more. Mailbox magazine shows you how to use poetry, crafts, puzzles, research projects, children`s author profiles, and various hands-on activities to make your students` learning experiences fun and memorable. Issues also include ideas from teachers around the country, instructions on setting up creative classroom displays, and time-saving tips.