Mashable reports that Starting soon you’ll be able to share tweets via email, directly from Twitter’s website. A feature already present in the mobile app, you’ll be able to send a tweet to anyone directly from your Twitter stream or the details of a particular tweet, regardless of whether or not the recipient is a Twitter user.
In addition to sending the tweet to a friend, you can also opt to add a personal comment to go along with it. The comment is sent along in the body of the email rather than on Twitter itself, allowing you to comment about a tweet without making those comments public.
Read more details on this feature at Mashable.