I believe the Kindle app on the iPad only supports viewing of Kindle books purchased from Amazon's Kindle store. There are work-arounds to get other files into the app, but I don't think there is any support for the "e-mail to Kindle" functionality which, as I understood it, was meant primarily to get content into an actual Kindle.
You are probably better of seeing if another e-reader app is capable of displaying your Baen's book on the iPad. If you really want to have it accessible in the Kindle app, it may be possible, but almost certainly not as easily as using the "e-mail to Kindle" method.
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