Apple Mail Quitting after Turning on Mail Extensions

An Apple Mail crash is being reported by Mail Extension manufacturers, which has been isolated to Apple Mail.  Those who use any extension may experience an intermittent or persistent crash when using any Mail extension, preventing them from using Apple Mail. This issue will continue until Apple releases a fix in a later update.

Disabling junk mail filtering in Apple Mail has been shown to be an effective workaround.

Follow the steps below to turn off junk mail filtering.

1. choose Apple menu   > System Settings > Privacy & Security > Extensions > Added Extensions
2. Turn off Daylite
3. Open Mail
4. From the menu bar, choose Mail > Settings
5. Click Junk Mail
6. Turn off Enable junk mail filtering
7. Quit Mail
8. Reopen Mail
9. From the menu bar, choose Mail > Settings
10. Click Extensions
11. Turn on the Daylite Mail Assistant