Only allow new incidents via web portal but allow email responses

Only allow new incidents via web portal but allow email responses

Hi,
      I'd like to know if it's possible to configure SC+ in such a way that any new calls must be raised through the Client Web Portal, but any subsequent responses can be received via email.
 
      What I'm trying to achieve is a way in which I can enforce users to populate certain key fields when they raise an incident (which I don't believe can be enforced via email) but would not want to enforce all future updates to be sent via the Web Portal as all of our clients are used to the convenience of replying to email updates.
 
      Can this be achieved, and if so, how?
 
Many thanks in advance,
      Andy

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