I suspect that Google going out of their way to make this required had a very reasonable and thought-out process, while the sender's omission was on oversight, so I haven't contacted Google Workspace support.
What's truly iffy is that GMail doesn't have the same strict requirements, and there's no way (at least that I found) to turn it off for my Google Workspace domain.
What's truly iffy is that GMail doesn't have the same strict requirements, and there's no way (at least that I found) to turn it off for my Google Workspace domain.