RSS to Email Services
Your blog comes with an RSS feed, but does it offer an email newsletter, too? With RSS to email services, you can keep your readers up to speed via email — automatically. As a reader, you can subscribe to any feed though email, too.
FeedBlitz - RSS to Email Service
FeedBlitz turns RSS news feeds into email newsletters for publishers and readers alike, but the former it also offers auto-responders, list segmenting for mailings, surveys and more.
Google FeedBurner - RSS to Email Service
Google's FeedBurner turns feeds into mailings with much simplicity but also the easy option to add AdSense advertising or Google Analytics click tracking, for example.
Nourish - RSS to Email Service
Nourish turns your RSS feed into a good-looking, customizable newsletter. You can combine multiple feeds into one mailing and schedule flexibly, too.