title: Can/should IdentityServer4 be used to create a token for user-email verification
body: <p>I have IdentityServer4 setup for API authentication although I have a use case where I want to verify that a guest (user) is essentially a valid user.  A valid user in my case is anyone with a valid email address, so I want to do the following:</p>
  
  <ul>
  <li>send the user an email with a verification token (preferably something which is a mash up of their email address, some salt and an expiry</li>
  <li>the user can then enter this token into my app and they are "allowed" to go ahead</li>
  </ul>
  
  <p>I was wondering if IdentityServer4 can/should be used to achieve the above?</p>
  
  <p>Their <a href="http://docs.identityserver.io/en/dev/topics/tools.html" rel="noreferrer">tools</a> show that you can generate a token although I am very new to this topic so was hoping for some guidance.</p>