To answer this question, you would simply say your email address. For example:
* Mi correo electrónico es [your email address]. (My email address is [your email address].)
If you don't want to share your email address, you can politely decline by saying:
* Lo siento, pero no puedo compartir mi correo electrónico. (I'm sorry, but I can't share my email address.)
Let me know if you have any other questions!