title: Redmine email notifications
body: <p>I am starting to work with redmine and I need to configure the email notifications for users
  I want users to receive emails when there is an issue assigned to a group they are part of,but I also want some specific users (like managers) to receive all emails from all issues.
  And the actual configuration of redmine does not allow me to do that because is the same configuration for all users.
  Any ideas?</p>