I'm trying to get rid of warnings about "the recipient [email protected] does not belong to your organization", which shows up for me pretty much every time I reply to someone not in my contact list.
https://support.google.com/a/answer/7380041 tells me to look at Apps / G Suite / Gmail / Advanced settings, which is fine, but I cannot find anything about "Unintended external reply warning" on that page, and there is nothing about how to "Select your top-level organization" either.
For me, the Advanced settings page has three tabs: General settings, Email addresses and Labs (titles roughly translated from Swedish), and neither of them mention anything about "unintended externaly reply" (in any language :)
Edit: this is on a free account