Fix crashing in macOS High Sierra – remove and rebuild Envelope Index files High Sierra Crash - Error MessageSince upgrading to the very first public beta of macOS High Sierra, I was encountering an issue with crashing after a few minutes – and since the crashes were still persistent in the most recent 10.13 Beta (17A358a), I started looking into it myself, rather than waiting for another beta release to fix this.

With success: I was able to fix my crashing continuously in macOS High Sierra by rebuilding Mail’s Envelope Index files.

How to fix crashing in macOS High Sierra after upgrade

Turns out that after the OS upgrade, the indexes were broken and causing it to crash. Time to rebuild them:

  1. Quit in case it’s running
  2. Go into the MailData folder (using CMD+G in Finder) located at
    ~/Library/Mail/V5/MailData High Sierra Crash - Find the Envelope Index Files
  3. Move the following files to the Trash (or to your Desktop, in case you want to backup)
    • Envelope Index
    • Envelope Index-shm
    • Envelope Index-wal High Sierra Crash - Fix Removing Envelope Index Files

  4. That’s it – now restart & confirm to rebuild the index (this might take a while…)

Once done, should run without crashing anymore. Kudos to this old Apple-Holic article over at for describing the procedure!

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