Since I’ve installed the Beta 11, no sound play when a message is sent, even though the setting is enabled (see screenshot)
Check you have the latest Beta v11.0.196.
Have you tried removing and readding your sending sound & then Saving Settings ?
Or tried disabling & Saving Settings. Then close & reopen eM Client & re-enable & Save Settings ?
If you have tried the above, are you using the Mac or Windows version ?