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*

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