Email Creator if you don't owe that

i want to make website or toll to create email even though if you don't own that domail. Want to make website or email tool for the custormer who can create email of any domain even though they don't have that domain. As an Example : if some one want to creat email of [login to view URL] but he does not owe that domain but still he want to create email with [login to view URL] so he need to come our website or toll which we will develope and he can create email with [login to view URL] and also can send or receive email with that domain.