On my MacBook my Airmail is working and fetching mails fine, but Apple Mail has not fetched any new mails in days. I hit the "Update" envelope like 40 times, and clicked on "Rebuild" in the "Mailbox" menu, but it's stalling. Apple Mail is dead. It can send emails, but it does not fetch, from neither account (Google, Outlook, iCloud). I searched online but couldn't find anything helpful. Any ideas or tips?