I am a girl who has a non-practising male Muslim teacher. Is it permissible for me to send him religious advice via e-mail without mentioning my name?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.

Firstly, we explained in Fatwa 82431 the ruling on studying at mixed campuses, so please read it.

Secondly, offering advice to such a teacher is, in principle, required, unless it leads to temptation or corruption. It is a part of encouraging good and forbidding evil. Indeed Allaah The Almighty Says (what means): {You are the best nation produced [as an example] for mankind. You enjoin what is right and forbid what is wrong and believe in Allaah.} [Quran 3:110] Moreover Tameem Ad-Daari narrated on the authority of the Prophet, sallallaahu ‘alayhi wa sallam, that religion is An- Naseehah (sincere  advice). [Muslim, An-Nasaa’i, Abu Daawood and Ahmad]

However, if this action will lead you to corruption, you are not allowed to do it, because avoiding prohibitions has priority before fulfilling such obligations. Indeed Abu Hurayrah narrated on the authority of the Prophet, sallallaahu ‘alayhi wa sallam, that he ordered the Companions to avoid whatever he forbade them from and to undertake whatever orders he asked them to observe. [Al-Bukhari, Muslim, An-Nasaa’i, Ibn Maajah and Ahmad]   

Furthermore, it is unnecessary to mention your name in the messages. In fact, it would be preferable that you do not mention it.

Allaah Knows best.