No idea where the logs are but yeah, the email app is buggy. I have had similar weird things happen. A power off/on always fixes it for me.

One thing I am not sure of how to do is unselect an email in the inbox. I often want to mark all the mail then delete it all. But if a message is highlighted it only deletes that one and i can never figure out how to unhighlight it! I have to exit the app then restart it so nothing is selected.