I have MBA 128 GB, and my local Mail cache is too large to be stored on the HD. Now, I have the external 16 GB SD card plugged in via compact Nifty adapter. It's always mounted.

How can I set up the Mail app to store its data on that SD?


Mailboxes are stored in ~/Library/Mail. You can move this to your SD card then symlink the new location back to the original location.

  1. Move ~/Library/Mail to your SD card.

  2. Symlink the folder:

    ln -s /Volumes/SD/path/to/your/Mail ~/Library/Mail

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