Mac Mail Keeps Crashing or Quitting? How to Fix It in 2026

When Mail keeps crashing on a Mac, force quit it, restart the Mac, then reopen Mail while holding Shift so it doesn't reload the message it crashed on. If it still quits, turn off Mail extensions in Mail > Settings > Extensions, update macOS, rebuild the mailbox that triggers the crash, and test in safe mode.

A Mail app that vanishes every few minutes is worse than one that won't connect, because you can't even read what's already on your Mac. The good news is that crashes usually come from a short list of causes: one bad message, an add-on, a damaged mailbox or an out-of-date system. This guide covers Mail on macOS 27 Golden Gate and the releases before it, in the order I'd work through them, with a backup step before anything that touches your data.

Quick answer: which fix matches your crash?

The moment Mail quits tells you most of what you need. Find your pattern below, then jump to the matching fix.

That's the order I follow myself. When Mail crashed the morning I had a signed proposal to send, I sent it from webmail in two minutes and left the fixing for lunch, when a slow rebuild wouldn't cost me anything.

Before you change anything: back up your mail

A backup matters before any Mail fix that rebuilds, removes or reinstalls something. Most mail is safe on the server, but messages in On My Mac mailboxes and some older POP accounts may exist only on your Mac.

1. Time Machine: connect an external drive, open System Settings > General > Time Machine, add the drive as a backup disk, then choose Back Up Now from the Time Machine menu, as Apple's Time Machine guide explains.
2. Export the mailboxes you can't lose: in Mail, select one or more mailboxes and choose Mailbox > Export Mailbox, then pick a folder. Mail saves each one as an .mbox file you can import later (Apple's export guide).

If Mail won't stay open long enough to export, Time Machine alone is enough. I export my On My Mac folders before every rebuild anyway. Sixty seconds of exporting beats an evening of wondering what a rebuild just threw away.

How to fix Mail crashing on Mac: 9 fixes in order

1. Force quit Mail and restart the Mac

A restart clears whatever state Mail got stuck in, and it's Apple's own first step for any app that freezes or quits on a Mac (Apple's guide):

1. If Mail is frozen, choose Apple menu > Force Quit, select Mail, then click Force Quit. You may lose an unsaved draft.
2. If Mail already quit and a dialog appeared, you can click Reopen.
3. If it quits again, choose Apple menu > Restart and try once more after the Mac is back up.

2. Open Mail with Shift held so it skips the last session

Mail tries to restore its last session when it opens, so a single bad email that was on screen can crash it again on every launch. Holding Shift while you open Mail stops it from restoring the last session, a tip given to Mac users in Apple's Support Community.

1. Quit Mail, or force quit it if it's stuck.
2. Press and hold Shift, then click Mail in the Dock or Applications folder.
3. Keep holding until the Mail window appears, then let go.
4. Don't click the message or mailbox you had open before. If Mail stays up, that message is the likely trigger.

Apple also suggests trying a different file when one document makes an app quit (Apple), and for Mail the "file" is usually one email. Delete or move that message from your provider's webmail, then let Mail sync. Webmail can't reach a message kept only in an On My Mac mailbox, though, so for those, keep away from that mailbox and work through the fixes below. Mail once quit on me every time it reopened the same long newsletter; after a Shift launch and deleting it in webmail, it never crashed again.

3. Turn off Mail extensions

Mail extensions are add-ons from other developers that run inside Mail, and Apple names third-party plug-ins as a common reason apps quit after an app or macOS update (Apple). Turning them off takes effect immediately, according to Apple's extensions guide:

1. Open Mail and choose Mail > Settings.
2. Click Extensions.
3. Deselect the checkbox for every extension in the list.
4. Use Mail normally. If the crashes stop, turn the extensions back on one at a time until the crash returns.

To get rid of the one that's causing trouble, select it in the same list and click Uninstall, or delete the app that installed it. After one macOS update, Mail started quitting on me within a minute of opening, and the cause was an email-tracking extension I'd installed for a single campaign and forgotten about.

4. Update macOS

Mail comes with macOS, so its bug fixes arrive in macOS updates rather than through the App Store. Apple lists checking for software updates among its fixes for apps that quit unexpectedly (Apple). Here's how to update, per Apple's update guide:

1. Open System Settings.
2. Click General in the sidebar.
3. Click Software Update and install anything waiting.

While you're there, open the App Store from the Apple menu and update the apps that hook into Mail, since an old extension against a new macOS is a classic crash. Back up first if the update is a major new version of macOS.

5. Rebuild the mailbox that triggers the crash

Rebuilding makes Mail discard and re-create its copy of one mailbox, which helps when a crash always follows clicking the same mailbox. Apple's rebuild guide gives two steps:

1. In Mail's sidebar, click the mailbox that crashes Mail.
2. Choose Mailbox > Rebuild.

For IMAP and Exchange accounts, which covers iCloud, Gmail and most work email, Mail deletes the messages and attachments stored on your Mac and downloads them again from the server, so the mailbox looks empty until the download finishes (Apple). On a large inbox that can take a while, so leave the Mac plugged in. Export On My Mac mailboxes before rebuilding them, since there's no server copy to fall back on.

6. Turn off one account at a time

When Mail crashes at random a few minutes after opening, one account syncing something Mail can't handle is a likely suspect. Disabling an account hides it without deleting anything, using the steps in Apple's accounts guide:

1. Choose Mail > Settings, then click Accounts.
2. Select an account and clear Enable this account.
3. Use Mail for a while. If it stays up, that account is involved; if not, turn it back on and try the next one.

Once you've found the account, rebuild its inbox (fix 5). If it still crashes, take the account out of Mail and set it up fresh: select it under Accounts, then click Remove, and add it back afterward. Apple warns that removing an account deletes its messages from your Mac, with copies staying on the server, and suggests moving any messages you're unsure about to an On My Mac mailbox first (Apple).

7. Test Mail in safe mode

Safe mode starts your Mac without login items, the extensions macOS doesn't require and fonts it didn't install, and it runs a basic check of the startup disk and clears some caches (Apple's safe mode article). If Mail works in safe mode, something that loads at startup is the problem.

On a Mac with Apple silicon (Apple):

1. Choose Apple menu > Shut Down and wait until the screen is black.
2. Press and hold the power button until Loading startup options appears.
3. Select your startup disk, usually Macintosh HD.
4. Hold Shift and click Continue in Safe Mode, then log in.

On an Intel-based Mac: turn on or restart the Mac, immediately press and hold Shift, and let go when the login window appears. You may be asked to log in twice.

You'll see Safe Boot in the menu bar of the login window. Open Mail and use it as usual. To leave safe mode, choose Apple menu > Restart (Apple). If Mail only behaves in safe mode, look at login items, security software and anything else that starts with your Mac, and remove recent additions one at a time.

8. Read the crash report

When Mail crashes, macOS keeps a crash report about it that you can open in the Console app. Apple's Console guide explains where to find it:

1. Open Console (it's in Applications > Utilities, or search for it with Spotlight).
2. Under Reports in the sidebar, click Crash Reports.
3. Select a report that mentions Mail. Its details appear below; double-click to open it in its own window.

You don't need to understand the whole report. Skim it for the name of an extension or another developer's software, which points straight back to fix 3. Administrator accounts can see every report; standard accounts see only user reports (Apple).

9. Reinstall macOS without erasing your Mac

Apple's general advice for a crashing app is to delete and reinstall it (Apple), but Mail is part of macOS, so the equivalent is reinstalling macOS from macOS Recovery. Apple says reinstalling doesn't remove your apps or personal data, and still recommends backing up first (Apple's reinstall guide). The way into macOS Recovery differs between Macs with Apple silicon and Intel-based Macs, and that reinstall guide walks through both. Keep the Mac awake and the lid open until it finishes.

I'd treat this as the last step, and only after a fresh Time Machine backup. If Mail still crashes after a clean reinstall, it's time to contact Apple Support with the crash report from fix 8.

What about deleting Mail's index files?

Plenty of guides suggest deleting files inside your Library folder to force Mail to re-index everything. Apple doesn't document that procedure on its support site, and a wrong click in that folder can remove mail stored only on your Mac. I'd stop at a mailbox rebuild and a macOS reinstall, and hand anything deeper to Apple Support with a full backup in place.

Report the crash to Apple

If Mail keeps crashing after a macOS update, other people are probably seeing it too, and a report helps Apple find the pattern. Apple's macOS feedback form asks for your Mac model, macOS version and what happened. Apple says it reads all feedback but can't reply to each submission individually, so use it for the record, not for help. For help with your Mac, contact Apple Support.

When I write one of these, I stick to the three things an engineer needs: what I clicked, what I expected and what happened instead. One crash per report, with the macOS version in the title.

How to keep Mail from crashing again

• Install macOS updates within a week or two of release, after a backup, so Mail gets its fixes.
• Keep Mail extensions to the few you use, and check Mail > Settings > Extensions after every major update.
• Keep important On My Mac mailboxes exported, or covered by Time Machine.
• When one message makes Mail quit, delete it from webmail instead of clicking it again.

If Mail stays open but nothing new arrives, that's a different problem with different fixes; see Apple Mail not updating on Mac. For the basics of setting Mail up again after removing an account, the Apple Mail guide walks through it. And if you're done with crashes for good, Apple Mail alternatives compares the other Mac email apps.