mail app taking storage
Hi all, my mail up is currently taking about 10 GB of my storage space (I'm running BigSur OS11.6 at the moment and I need the space to update to Monterey) I've deleted all emails except 7 in one mailbox, all trash and all junk mailboxes by going to Mailbox> Erase Deleted Items in both mailboxes in all accounts but it's still taking 10GB of space. Can anyone help please?
MacBook Air 13″, macOS 11.6