For those of us who don't want to entrust this to Apple and who'd like to use our own domain?
That being said, this is a good list:
https://www.reddit.com/r/privacy/comments/108wzvg/what_is_th...
Not sure I trust the longevity of some of them, though. I do use https://temp-mail.org/en/ or other similar services for some logins for some services I'm not afraid to lose access to, though (especially for places likely to spam me).
For those of us who don't want to entrust this to Apple and who'd like to use our own domain?