Right. You still need a domain. Then own email server is not an option. Then inbox.lt and similar are the only option. Or fake gov ID.

It's probably gonna get blacklisted too, if it isn't already. Fiatjaf is right. I have tried all anonymous email services, and all of them, ALL of them, get blacklisted in the end, sooner or later, and you have to stop using them because the emails don't reach destination.

It has been working for many years and still does. So do you want to have an anonymous email address to put it into registration forms, or do you want to use it to send spam?