The email on my mac is not working. I have tried several things.
Is there a way to delete the email files (files where mac stores the emails) on my mac book pro so that it downloads all my mail again. (I will leave it to download overnight).
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You may need to rebuild a mailbox to update the list of messages it contains. For example, if messages appear to be missing or garbled, or if you can’t find all relevant messages when you search using the Entire Message search option.
In the Mail app on your Mac, select a mailbox in the sidebar.
Choose Mailbox > Rebuild.
When you rebuild mailboxes for IMAP or Exchange accounts, messages and attachments stored on your computer are discarded, and then downloaded again from the mail server to your Mac. Your mailbox appears empty until the download is complete.
Delete only work in some cases, check your email configuration before you act: if you're using POP3 or your IMAP settings are MOVING messages from the server into your local computer, deleting messages or attachments will result in loss of data. I would recommend trying with the mailbox rebuild procedure suggested above.