Instead of at the top?
Most people won't email a post until they've finished reading it, and they finish at the bottom of the post and I think that would be a good place to put your excellent wp-email plugin.
Right now it's currently placed at the top of the post and most people won't email a post until they've read it.
once they've read it they may forget there's an email option at the top of the post.
Wouldn't it be better to have it default at the bottom like the share this post type plugins so more readers and bloggers would use this?