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As of macOS Sierra, assigning a custom sound file in Mail no longer appears possible. All I get is “New Messages Sound” in addition to the old options:

New Messages Sound

Is there a way to assign a custom Mail sound in macOS Sierra, possibly via editing a plist?

The interesting thing is, I’ve logged into the Guest account, and even though the same option is selected, the sound that plays when a new mail comes in is the sound I had previously under MY user account. But I can’t seem to find where that sound file is assigned.

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Add your custom mail sounds to ~/Library/Sounds. Then they’ll show up in the Mail preference pane.

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    Awesome. Thanks! Now if only those sounds would show up in Messages and FaceTime too…
    – user11633
    Oct 15, 2016 at 2:31

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