Revising from after_save hook approach brings me the question of how to control ActiveRecord id ... this is the error:

```
<Mailer (class)> received :send_later with unexpected arguments
  expected: ([:deliver_email_update_activation, #<EmailUpdate id: 47, user_id: nil, mail: nil, token: "b484848fe22f150dc789402fb00dbf336866c830", activated: false, created_at: "2013-12-30 19:21:37", updated_at: "2013-12-30 19:21:37">])
       got: ([:deliver_email_update_activation, #<EmailUpdate id: 48, user_id: nil, mail: nil, token: "1abee01b1c5833449b6b58bf3238cbbca924781c", activated: false, created_at: "2013-12-30 19:21:37", updated_at: "2013-12-30 19:21:37">])
```