title: can we use SNS for sending multiple email addresses as inputs in stack
body: <p>How to give multiple email addresses as Inputs in <code>amazon SNS</code> as subscribers using stack. Just I want to take email address as input parameter and allowed it to take multiple email addresses as comma separated string i.e <code>CommaDelimitedList</code>, but it was not taken by <code>endpoint</code> in resource subscriptions.</p>