IMPORTANT! IMESSAGE AND IPHONE

MY MUM WANTS TO MESSAGE ME THROUGH IMESSAGE, SHE GAVE ME HER EMAIL, if i message her now what will she get of mine? (my phone number or my email?) i know it doesn't make sense but please help as soon as possible!

Email

I would just ask your mom for her number.

Go to settings > Messages > Send & Receive. Where it says "start new conversation from" whatever you have selected is what she will see, just select whichever method you want to start the conversation with.