I am running 10.8.1 on a new retina macbook.
I have tried every preference panel I can find and nothing seems to be able to turn off the incoming mail sound.
I am getting what I think is the "Basso" sound whenever a new mail message comes in.
I went to Mail Preferences and picked New Messages Sound>None.
Then I unchecked Play sounds for other mail actions
Still get the basso sound when new mail comes in.
I even rebooted to see if that would fix it. No luck.
Then I went and tried to change the sound to something else. That didn't work either. Stuck on basso!
Even checked Notifications Center and the Sound Preferences Panel. No luck there either.
I don't want to turn off sound entirely, just stop incoming mail sounds.
Any help or suggestions would be appreciated!