[redacted] is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
If you really wanna run your own mail server, just get a cheap VPS. For around $5 a month, you get something with better uptime that's probably not on any blacklists.
Just be aware that the spam struggle is real and you'll have to manage certs and updates.
@redacted https://mailinabox.email/ can cover the certs and updates for you!