Can ServiceDesk group emails under one ticket?

Can ServiceDesk group emails under one ticket?

We're using Service Desk to manage live production issues.  We have successfully wired it up to an email address so new issues just need classifying and assigning.  However replies to the original email end up creating new tickets, which rather defeats the objective.  Can it be made to recognise replies and group them together under one ticket, much like how a CRM system works?

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