Mail says it can't find the mail folder even though the path is right
Sometimes you might get an error saying it can't find the Library/Mail folder which is at /VolumeName/Users/Yourname/Library/Mail And you will notice that if you go into that folder (Library), you do indeed see a folder there called Mail. So In short it's lying. To fix this, just type the following into Terminal (where " yourname " is your login name): rm -rf /Users/yourname/Library/Mail/Containers/com.apple.mail*