I recently edited this question, which had formatting problems and had the question in form of an image as a link. The user who's question I had edited, then asked me for my email id through the comments.
On asking the user for the purpose of such a request, he/she replied that it was to ask "mathematical questions only".
I am unsure what to do in such a situation. I am certainly not giving my email id out on a website that can be accessed by absolutely anyone, for obvious reasons.
Is there any safe and secure channel or way to communicate with such a user? Even if such a channel exists, how safe will it be to give your email id to such a person claiming the above?
Please help me on what to do in such a situation.