I'm not a twitter user. However I just read this new ability that Twitter is rolling out and wondered if someone emailed me a tweet, how likely is it that my email address will be 'shared'?
I'd hate that
http://blog.twitter.com/2012/11/sharing-tweets-just-got-easier.html
the emailed status, I'd assume, is not stored on Twitter at all. I think it just copies the content, of the shared tweet, to the sender's default email program and (maybe at most) you'll get ~weekly spam from Twitter saying something along the lines of -if I were to send a tweet by email to you:
Hazelnut@domain.ext Nergal2 has tweets for you
with a listing of a couple tweets from people in my timeline, in order to entice you into joining twitter.
So it's like FaceBook.