Just to the right of the on/off should be a gear symbol.Get back to Mail Shield in settings, click 'Customize' then unselect 'scan outgoing mail'.
I'm afraid there is no "customize". Just "Mail Shield" with a checkbox, or or off and neither way works.![]()
No gear icon, and no on/off, nope.
Actually "on/off" was what I was originally looking for. Had to uncheck "Self-Defense mode" (and that's already in Settings/Troubleshooting). There's no enable/disable option as such.
Avast keeps trying to sell me on Google Chrome. If I were a cynic I'd be inclined to think they're causing other browsers to stop working in order to sell that.

They're always trying to sell me their other products but from what I understand if you buy their Premium service you can disable those ads. In the free version you can limit the amount of time the pop up is visible.