It’s surprising but I can’t seem to find any mention of this in searching (which makes me wonder if it’s a customization) but I occasionally receive emails saying “Your team hasn’t heard from you in a while. How about posting something here?” but there’s no way I can find to turn it off.
It’s different from the “Activity Summary” emails, which I do have disabled, and so I’m wondering if there’s a hidden setting, assuming this isn’t a customization, where I can deactivate the functionality?