“Net send” message to every windows PC in the school. IT was not happy about that. Guess they should’ve disabled that exploit. I think it was before windows xp had (SP2?) disabled it by default.

Proton and fastmail you can use custom domains. I only have experience using fastmail. They provide great instructions for the settings in cloudflare (mx records, etc). My domain is purchased through namecheap.

I can receive mail on *@mydomain.com and I can send email from any thing I want ad-hoc (anything@mydomain.com or anything@anything.mydomain.com)

I thought about selfhosting as well, but the internet concensus was it can be a hassle with your email getting rejected.

Is the dev on lemmy? Have a link to a post of his about this consideration? I would love a Sync for Lemmy - mostly to cut down on the learning curve of a different dev’s app.