Well sure, you can, and I've already done so. I brought it up because it shouldn't be enabled by default; we're talking about actively putting something into the user's emails without their approval first. That's not the kind of 'feature' you enable without consent of the user. It's also worrisome that it seems random as to when it gets turned on for the first time; I'd never even been aware of the setting until today, despite others already having this issue since at least 2015, so I'm not sure if it's either random, or a decision was made recently to make it enabled by default again. Regardless, I think this is a feature that either users turn on themselves, or Avast actually prompts the users for permission first. I can't imagine anyone would want any program on their machine inserting something into their emails without their permission first.