There are two ways you could do this

  1. In the yes/no field in the DB, set the default value to yes
  2. Before sending the email, change the user’s approved value to yes

Since you have an approved field, I’m guessing you’re only selecting users that could sign up to your platform. If this is the case, why not add the action to change the value to yes upon approving?

If you don’t shortlist/select certain users that could sign up, why do you have an approved field?