Contact answer via email to Closed case

If a contact answer to a closed case creatio will create a new case, 

but not give much context in the new case that it was created from a pre-existing case.

Is there an easy way to make the new case linked to the old case via configuration?

Or is it necessary to create a business process  that reads all emails and searchs for case id, etc and then link in the Business Process?

Thanks,

Luis