[MlMt] alert sounds

[Shoshanna Green]

I'm running MailMate v5820 under High Sierra, and even though I have disabled "Play sound for notification" under System Preferences > Notifications > MailMate, my system BINGs every time a message arrives. (As well as presenting the banner alert I do want.)

I have been completely unable to figure out where this sound is coming from, so that I can turn it off. Any ideas? Please?

Shoshanna Green
shoshannag at gmail.com