I'm no longer using the Apple Mail app built into OS X and it is consuming 20GB+ of space from old mail. However, I do use Calendars and Messages on those accounts. I unchecked "Mail" on those accounts, but that doesn't clear the space. If I try to remove the Internet Account, it warns that it will delete all my Messages (the Messages App messages), which I don't want to do.
It has been suggested that I simply delete the folder where Mail App stores the messages
Can I safely free up space from mail messages from Mail using this method?
Is there another method to safely do this?