Maybe there’s some way, but Google didn’t want me to know about it. All their docs made it seem like I would have needed to have an enterprise version (no clue what they call it but you know what I mean) of Google services to get it to work, not the free version. I tried for a couple days anyway and couldn’t solve it, so I figured it was a good opportunity to de-google my email. Once I switched to Proton I had it set up in hardly any time at all, and all the different authentication protocols too. Longest part of the process was simply waiting for record propagation.

That works to some extent, although certain receivers like Yahoo will bounce messages because it breaks sender authentication protocols. I had to switch from Gmail to Proton (paid, the free version doesn’t allow it) to fix that.