1. It is useful to complain about the mailbox of Tongji University President. The establishment of the principal's mailbox is to enable students to better fulfill their rights and obligations and express their demands.

2. In Tongji University, if students are dissatisfied with the campus or find some loopholes, they can write to the principal's mailbox anytime and anywhere. Today's mailbox is also very different from the previous mailing mailbox. On the home page of the school, the principal will mark his email address on it, so that students can contact at any time and anywhere. After receiving the letter, the principal will handle it in time.