But not too nice.
This will help me to know how to respond to your message, so thanks for letting me know.
You don't have to tell me your name, but I think it's only cordial that way, don't you?
I won't share your email with anyone except my own frontal lobe. But I'll need you to give it to me so I have a way to respond to you. Don't worry, I hate SPAM as much as you do.