title: Android Firebase Email Validation
body: <p>I am developing an app with Firebase and I have to register users to the app using email registration method provided by Firebase. I pretty much did well on Email verification and such things, but one problem, I'm encountering is that "how to validate" entered email address?</p>
  
  <p>By validation, I don't mean if its a correct email form, such as <code>blab@blabla.com</code> pattern, for example <code>Iamsomething@gmail.com</code> is an invalid email which cant get email verification, although it is perfectly fine in terms of email pattern.</p>
  
  <p>I want to make sure that invalid emails are not registered to authentication database in the first place. How can I solve this problem?</p>