I don't know if it's that simple. As a litmus test, try to set up your own mail server. See how many milliseconds it takes for it to be blacklisted by gmail. And then observe the response time for their support, when you try to clear up the confusion that google has about your intentions.

I run my own mail server, not blacklisted. Now I'm a bit of a special case, I know mail well.

But when a moderately technical colleague wanted to do the same, I told her to use Mox, she set it up and Gmail doesn't block her either.

So... would you please elaborate?

I've built mail servers before Gmail existed that lasted long enough to get blacklisted by Gmail.

Fixing it was always pretty simple -- or at least, non-mysterious. They'd bounce some things, I'd look at the headers of the bounced messages, and therein were links to instructions there that showed how to resolve whatever issue it was this year.

Just follow the steps, implement the new thing, and stuff started flowing again in rather short order. Not so bad.

IIRC, the only time it ever cost us any money was when the RBLs started keeping track of dynamic IP pools and we needed to finally shift over to something actually-static.