How can we improve WHMCS?

When an 'unauthorised' user sends a reply to a ticket in a client-only support department, they are entered into the ticket import log.

Previously, they would have got an email telling them that they are not a client and to log in to the client area or reply from their client email address (along those lines) - now they just get nothing.

We would not want to import any email into a ticket which is unauthorised to interact with the ticket; for security reasons.

But, we would not want their email to just vanish into a blackhole (the ticket import log) without any kind of notification to the sender of the mail.

Please can WHMCS re-instate the notification email that was previously sent to unauthorised ticket senders.