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Cannot Launch Mail

If you get this message: "Mail cannot save information about your mailboxes
because there isn’t enough space in your home folder"...

Check for a home directory access/permissions issue,
then try deleting the file "Envelope Index-journal" in
~/Library/Mail or ~/Library/Mail/V6/MailData

Or from the terminal:
either for older versions: cd ~/Library/Mail
or for newer versions: cd ~/Library/Mail/V6/MailData
Then: rm Envelope\ Index-journal

That will force the sqllite database to reindex which will help if a corrupt index has caused this error.