Original post by Ben Eitzen, Software Engineer
Fresh content is the fuel that drives the blogosphere; it keeps readers coming back to your blog. Our team is always thinking of new ways to connect users with the freshest content across Blogger, and today we're happy to offer a new, powerful way to do just that with Follow by Email.
The Follow by Email gadget provides blog authors a simple way for their readers to subscribe to the latest hot-off-the-press updates, which are delivered directly to the reader's inbox. When new blog content is published, all subscribed readers will receive a daily email notification of the new published posts, which includes a copy of the new content as well as links back to the actual posts.
To enable Follow by Email, click the Add a Gadget link from the Design | Page Elements tab, and then select the Follow by Email gadget which should be at the top of the list. Once you add the gadget, readers visiting your blog can then just enter their email address and click Submit.
Taking advantage of Feedburner technology, Follow by Email will also track your subscription information, such as the number of subscribers and daily views. To view these stats, log into Feedburner.com, and select the appropriate blog feed from your list.
see also: http://gmailblog.blogspot.com/2011/03/new-connection-bar-in-gmail-for-iphone.html