Mail, Messages and the leftovers apps leave behind

This chapter covers the space that belongs to apps rather than to you. None of it is precious, most of it is invisible, and all of it can be managed with tools Apple already provides.

How much space does Mail hold?

Every attachment you have ever opened is stored locally so that opening it again is instant. Over years, that becomes tens of gigabytes. Apple exposes this through the same Storage screen you learned in chapter one: expand the Mail entry to see how much of the total is attachments, then remove the ones you no longer need.

1. Check the Mail categoryOpen System Settings > General > Storage and expand Mail to see its attachments size.
2. Open Mail ’s own controlsIn the Mail app, go to Settings > Accounts and review Download Attachments. Switch to None or Recent to stop attachments being stored automatically.
3. Remove stored attachmentsUse Mail’s Storage panel or the attachment-cleanup recommendation to clear locally cached attachments. The messages themselves survive; only the stored files are discarded.
4. Rebuild later if neededAny attachment can be retrieved again by opening its message while online.

Messages media

Chat apps are the second silent consumer. A conversation full of photos and short videos can quietly outweigh a serious work folder. In System Settings > General > Storage, expand Messages to remove videos and attachments from old conversations. In the Messages app you can also review individual threads and delete the heaviest media; everything stays readable, only the media is removed.

Uninstalling an app properly

Dragging an icon to the Bin removes the app bundle and little else. Support data, caches, preferences, saved state and logs stay behind, sometimes several gigabytes per large application. The built-in method is manual but reliable:

• Move the app from Applications to the Bin, and empty the Bin.
• In Finder, choose Go > Go to Folder and inspect ~/Library/Application Support, ~/Library/Caches, ~/Library/Preferences, ~/Library/Containers and ~/Library/Saved Application State.
• Delete only folders that clearly match the app you removed. Names occasionally differ from the app’s display name, so search the vendor name first.

Games, creative suites and developer tools

These three categories dominate application storage. Games keep enormous asset caches; video editors keep proxy media and render files; developer tools keep package caches and emulators. Each app usually offers a way to clear its own cache in preferences, which is preferable to hunting through Library folders. For Xcode specifically, deleting old device support files and derived data from within the app’s settings is both safe and effective.

A checklist for app-related space

• Set Mail to stop storing attachments automatically.
• Clear old Messages media in Storage settings.
• Remove apps you have not opened in a year, then clear their support folders.
• Empty the Bin and re-check free space.

None of these steps requires any software beyond Finder and System Settings, and each one is reversible until you empty the Bin. That is the whole point of this guide: steady, modest reductions that add up, executed with tools you already trust.