I am running out of some disk space, and noticed Mail has about 30GB of emails stored.
What is the best way to delete these emails? I don't need them as a server has a copy.
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Go to Mail -> Preferences -> Accounts
Apples's documentation does not say what happens when you change the status, but goes on to state:
It’s recommended to use the default selection (“All messages and their attachments”) so you can search entire messages. Additionally, keeping copies of messages on your computer improves junk mail filtering and includes the messages in Time Machine backups.