Search "Entire Message" in Apple Mail

[electrix]

I subscribe to about 400 RSS feeds in Apple Mail and I'm looking for a way to search them by keyword, pulling up every message that contains that keyword in the body or in the title as a result. For some reason, when I select "Entire Message," the search pulls up NOTHING, even for keywords that are clearly in the body. I've tried this for both "All Mailboxes" and the specific feed/mailbox that I'm targeting. The subject line search, however, works fine. What is wrong with my "Entire Messages" search function, and are there any plugins/alternate means of searching altogether that would be more efficient? Thanks!

 

[ruinfx]

id suggest a different reader. maybe google reader or safari.