I've got an older Macbook with a 256 GB HDD drive, running 10.12.6 (Sierra), with Mail 10.3.
It looks like a huge amount of storage (roughly 56 GB worth!) is being taken up by old Mail attachments — mostly attachments to sent messages, not received messages.
Where are these stored, and what is the easiest way to remove them? I've found a lot of reference articles online about deleting the contents of the Mail Downloads folder, but I don't know if that's what I'm looking for, as these are not attachments I received, but rather ones I sent. I don't want to
delete the entire message — I really want to keep a record of what I sent, to whom, and when.
And if possible I'd like to keep the attachments on the server (it's a Gmail account) so that I can retrieve them if need be. What are my options?
Best Answer
This will work only on IMAP accounts. Not POP3
Quit Mail.
Navigate there in Finder after turning on hidden files using command+shift+..
Then search that folder for kind:PDF or kind:Image or anything that you think is taking up space.
Delete all those search results. Verify that the folder is taking less space, or alternatively check "About This Mac.app" → Storage → Manage → Trash to see that you've actually saved some space. Empty trash.
Open Mail Preferences → Accounts → Select your account. Under Account Information, set download attachments to None.