Is it permissible for a Muslim woman to teach young men at university?

It is permissible for a woman to teach adult males if the matter is controlled by the Sharia guidelines, such that she adheres to the legal hijab, and there is no private seclusion (khalwa), and no softness in speech. However, it is preferable for her not to teach adults or adolescents, due to the danger involved for her and for them, and because the nature of teaching necessitates interaction, and there is well-known temptation in that. And everything that is a cause for temptation is forbidden.