If you utilize an rss feed the internal link structure points to the publisher and as Weblord stated that was the intended purpose of feeds. RSS feeds are a superior way to automate blogs and supplement your own content.
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"If PHP is peanut butter...then...MySQL would be the jelly. Together they can make one heck of a good sandwich." --- Netzilla 9/14/08
RSS feeds are a convenience for the use of individual people but use on a blog is taking readers away. This, of course, isn't an issue if you use only shortened feeds that give only the first paragraph with a link.
As a writer, I wouldn't be happy to see all of my articles reposted in full on another blog just because I offer an RSS feed.
You can do that but place their link as a reference after the post. But I highly suggest to put some content you have originally created like a little description to make your post unique. Unique content is important especially to google. Google bots love unique and fresh contents.
