Love your question: This is easy to do.
Within your blog create two RSS feeds - one for each market. The articles relating to each market need to have separate and different categories in the blog. Each feed is set up to only collate blog posts from that one category.
Here's an example of a client of ours who is a sports brand. They have three audiences: Coaches, Athletes and Coxswains (rowing crew).

http://www.rowperfect.co.uk/newsletter-signup/ Scroll down the page to see the explanation of the separate newsletters.

We set up a Feedblitz.com account for them and use these separate RSS feeds to deliver the content both as an email newsletter and also as an RSS feed for each one.

Get in touch if you'd like us to set this up for you. It's about 3 hours work in total.