It doesn't include your downloaded messages and email attachments. The problem with this calculation is that it's not entirely accurate. Under the Storage tab, select Mail by clicking the i icon.

Select the Apple menu > System Settings > General > Storage. If your Mail app has been acting strange, sluggish, or problematic, and you suspect cache could be weighing it down, here's how to check how much storage it's occupying: Sounds handy, but this comes with a price - space. What is Mail cache?Įssentially, Mail cache is locally stored copies of emails on your hard drive that helps your Mac locate emails quicker when you're searching through your mailbox. Let's take a closer look at how to clear the Mac Mail cache. There's no denying the macOS Mail app is great, but you may realize it's a vast storage consumer if you let the cache build up, you may encounter some frustrating issues like: Knowing how to clear your Mail cache shouldn't be overlooked if your Mac is low on space or your Mail app is acting particularly slow.

Location of apple mail preferences