I've configured BetterTouchTool to allow me to toggle read/unread status of an email when I press ⌥/ (option slash, a convenient shortcut near the arrow keys), using the "Trigger menu bar menu item" action. (See below screenshot.)

enter image description here

The shortcut works—when I trigger it, the read/unread status changes. (BTT is smooth as glass, I LOVE it.)

However, Mail.app also makes an audible and visual bell (screen flash and a sound) when I trigger the shortcut. It does this whether or not BTT is running or configured.

Is there some way I can suppress this bell sound and flash for this particular keyboard shortcut for Mail?

(I'm running Mail 9.3 on macOS 10.11.6, and BetterTouchTool 1.912 (523).)

P.S.: I tried several other unbound keyboard shortcuts, without configuring them in BTT but just pressing them in Mail, and all made the same flash and sound. I have no reason to think they will not make the same annoying sound if configured to actually do something through BTT.

1 Answer 1


Have you turned off Sound Effects
System Preferences>Sound

Untick the box play user interface sounds effects enter image description here

  • I don't want to suppress all user interface sound effects. They are quite handy when they're appropriate. But when I am using a command I intend to use, I don't want extra noise. Thank you, though.
    – Wildcard
    Oct 9, 2016 at 5:05

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