Tired of the Apple Mail Client Woosh sound on mail send I am using Macbook pro 13inch 2015 model. Using OSX Sierra.

Every time I send a mail with the apple mail client is makes a woosh sound. In order to suppress this sound I have done the following things


Go into settings -> notifications and switch off the notification sounds for mail client.





Disable User Interface sound effects in settings -> sound.




However still when I send a mail it makes a stupid woooosh sound.
Go to Mail's Preferences. ⌘+.

Mail > Preferences > General tab

Deselect the 


  Play sounds for other mail actions


checkbox.