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When I put on my headphone I can hear an app keep making a sound (a short bell, perhaps. It's hard to describe in writing) very frequently, almost like once or twice every second.

I have been going thru all app in 'Notifications' in System Preference and uncheck 'Play sound for notifications', for example:

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but it does not seem to stop it.

The only way to completely silence it is by turning on 'Do not disturb' in notification centre.

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By my observation it seems to be closely correlated to Mail's downloading messages activities

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So where can I completely turn off the sound?

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  • Check System Preferences > Clock and see if you have it set to make a sound on the hour or otherwise. That happened to me a while back and somehow I had turned that on. Dec 2, 2019 at 15:59

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It turns out the sounds came from the Mail app. It is the 'New messages sound'

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By switching it to None I can get rid of the frequent bell sounds.

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