There is huge amount of free mail service, unless you are talking about your own domain. Even with custom domain, there are some mail providers that accept Bit

There is huge amount of free mail service, unless you are talking about your own domain. Even with custom domain, there are some mail providers that accept Bitcoin. See here: https://www.privacytools.io/providers/email/ https://www.privacytools.io/providers/email/ And, once more: my previous point was that even if providers know your id, it is not public. There is no service you can use to ask what is name of e-mail address owner (I'm ignoring "whois", which is domain-specific, not mail).