does yahoo allow us to sign up for email adresses that have a domain name before the “@yahoo.com” like “mydomain.com @ yahoo.com”. reason i ask is i tried to do that, but the yahoo free sign up form states that it is unavailable on several of my domain names, so eitther yahoo does not allow one to register such a name with a “.com, .net or .org” in it, or someone else has registered my domain names as the prefixes before the “@yahoo.com”. i need to know what yahoo’s policies are about this. do they or do they not allow for domain addresses as i have stated here as email addresses? .