Though you may have thrown everything into the trash, you still have to empty the bin itself. Unlike your garbage IRL, if you just leave emails sitting in Gmail's trash, they will be automatically deleted after 30 days. But if your goal is to free up space, it's best to take out the trash right now.
If your email account exceeds the storage limits set by the account's provider, you can take some actions in Mail to free up space on the account's mail servers. In the Mail app on your Mac, do any of the following: Delete large messages or messages with attachments, or move the messages to a mailbox on your Mac.
In the Mail app on your Mac, choose Mail > Preferences, then click Accounts. Select an account, click Mailbox Behaviors, then check the setting for the Trash Mailbox option. If a mailbox is specified: You can view deleted messages in the Trash mailbox until they're permanently erased.
Open Finder, click the Go menu, and select Go to Folder. Plug ~/Library/Mail/V2 into the box and press Enter. Right-click or Control-click the folder with the name of your email account and select Move to Trash. You can then empty your trash to free up all those gigabytes.
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- CleanMyMac X. This is one of the best tools to clean up your Mac and it offers a wide range of features in addition to just cleaning up your Mac.
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The Mail folder grows so large because the Mail app downloads every single email and attachment to store them on your Mac. Attachments won't be automatically downloaded, but will be stored online until you use them — that'll save some space.
6 macOS Folders You Can Safely Delete to Save Space
- Attachments in Apple Mail Folders. The Apple Mail app stores all cached messages and attached files.
- Past iTunes Backups.
- Your Old iPhoto Library.
- Leftovers of Uninstalled Apps.
- Unneeded Printer and Scanner Drivers.
- Cache and Log Files.
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Permanently delete emails
In the Mail app on your Mac, do one of the following: Choose Mailbox > Erase Deleted Items, then choose an account. In the Mail sidebar, Control-click a Trash mailbox, then choose Erase Deleted Items.To stop using the Mail app, first disable or delete your email accounts. Click the Mail menu in Mail and select Accounts. Uncheck the Mail option for accounts you no longer want to use Mail with. Mail will stop downloading emails from those accounts.
We'll look at some folders you can delete on your Mac without causing any damage.
- Attachments in Apple Mail Folders.
- Past iTunes Backups.
- Your Old iPhoto Library.
- Leftovers of Uninstalled Apps.
- Unneeded Printer and Scanner Drivers.
- Cache and Log Files.
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Yes, you can delete the cache of the cloudphotosd. I just tried again and all my shared albums are still there. Quit Photos, if it is running. Delete the complete folder ~/Library/Containers/com.
Yes, you can get those temporary /private and /tmp folders to clear their contents by allowing OS X to run through it's own typical maintenance routine. Do not manually delete items in /private/var/ or /var/folders, you could break something or cause a problem with Mac OS X.