If Mail won't launch, and a message like "Mail cannot save information about your mailboxes because there isn’t enough space in your home folder" is displayed.
Check home directory access/permissions issue, then try deleting the file: Envelope Index-journal In folder: ~/Library/Mail Or: ~/Library/Mail/V6/MailData Or: substitute the correct V number for newer versions
Or from the terminal: cd ~/Library/Mail Or: cd ~/Library/Mail/V6/MailData Or: substitute the correct V number for newer versions (as above) Then: rm Envelope\ Index-journal
That will force the sqlite database to reindex and a corrupt index can cause this error.
My latest blog post: A Different View: People whose ideas differ aren't bad, they just have a different view. (posted 2025-07-22). Warning: mysqli_connect(): (HY000/1040): Too many connections in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 51
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Could not connect to MySQL: