I noticed that my rss to email notifications via feedburner had no paragraph breaks in yahoo mail (looks fine in gmail and hotmail.) I also tried sending some tests through FeedMyInbox and Mailchimp just to see if it was a feedburner thing and got the same results.
I found a few threads on how yahoo mail does not render paragraph breaks (i.e. http://www.dirigodev.com/blog/yahoo-webmail-ignores-paragraph-spacing/) that offer some a style tag workaround but I mickeyed things up trying to slip it into my rss source output and am a little scared to try messing with it any further.
I'm going to see if there is a way to slip it into the styling of the mailchimp template (since they allow me to make such alterations, unlike feedburner) but since they use a rss content function to pull the post I'm thinking that's probably not going to work. I thought I might reach out and see if anyone has come up against this and have a solution.
Its only a small minority of subscribers that actually still use yahoo mail but I hate that my notifications look so terrible for anyone who does. Any suggestions are welcome.