Probably was said already or on your to-do list anyway but here goes, I'd probably set up a "blog" where each post quotes the 1-2 "least-meatiest-most-promising" paragraphs of a daily mail (whenever it's lengthy/wordy enough). With the usual sign-up-4-free-for-the-full thing. Hook up on an RSS or Atom feed for oldtimers like me (signed up already though), because some may be reluctant but come around after a few days or weeks of "promising" snippets. And of course, organic search traffic coming in, ever-compounding as the (partial) content grows.