I have a few feature requests for the Subscribe by Email plugin.
1. Provide the ability to deliever the entire post via email
2. Ability to stylize/brand the emails that are sent to the user
3. Email confirmation after someone signs up for the blog
This functionality is offered in the jetpack subscriptions plugin but I would prefer to use the one provided by you because the emails from Jetpack come from wordpress and do not have the ability to brand. Not to mention it comes from wordpress and most of my users don't know what wordpress is.