But is there some way to make that mastodon.social address actually present itself as "@email@example.com" and make that be my canonical address? I would like that address to be the one that people find and see. Without running my own full Mastodon instance, I mean.
My PHP redirector is here, it's pretty simple.
Some searching suggests that "host-meta" and "nodeinfo" URLs might also be involved, but I don't know what those do and it seems to be working without those.