Cannot silence the mail

I'm puzzled. I'm trying to silence Mail. I have disabled mail Notification sound. I turned off in the preferences of Mail sounds - in other words, the new message is None and sounds unchecked for other mail actions. But I still have a sound Basso whenever Mail checks for mail. I checked the accounts and I don't see a place to kill sounds. Help please :-)

Stephen

iMac late 2014 retina 27 "OS X 10.11.6 Mail v 9.3 (3264)

 > System Preferences > Audio > put out of play user interface sound effects

Tags: Mac OS & System Software

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