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Mail folders

What Mail keeps on your Mac, which folders are safe to delete, and what you lose.

Folder	Safe to delete?
`~/Library/Containers/com.apple.mail/Data/Library/Mail Downloads` Opened email attachments	Check first
`~/Library/Mail` Your mailboxes	Keep

Clean up Mail with Gigabroom

Open Gigabroom and wait for the scan.
Open Clean Up and look under the group for these folders. Every folder above is named and labeled (Safe, Rebuilds itself, Check first, Keep).
Tick what you want to remove and click Clean Up. Items go to the Trash first.