Mail shows 100% usage for Gmail account, doesn't rebuild For some reason Mail shows me 100% account usage on my Gmail account. I've deleted most mails with attachments, erased deleted items and did a rebuild. However, the account information still shows 100%, I don't get new mail and nothing seems to work. When looking at gmail.com, there's 1% used.

I've already removed the account and added it again, restarted the Mac and now I'm running out of ideas.

Anyone knows a solution?
Try this. Quit Mail, then go to your home folder's Library folder (*) and move the folder com.apple.mail from the Containers folder to your desktop. Start Mail up and see what what happens - hopefully it will start behaving again. If it does, trash the folder you moved to the desktop. We've had several instances of odd Mail behaviour and trashing the Mail container has done the trick, restoring normal function.

(*) If you don't know how to access your Library folder, select the Go menu in Finder and hold down option/alt key to reveal the Library option.