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Email to Case will use the ThreadID in the email to find an existing Case. If your outbound email includes the ThreadID of the case you want the email attached to, any replies that also contain that ThreadID will be associated with the Case.
Here is a link that includes the formula you can use in a custom formula field to generate the ThreadID for a Case: https://success.salesforce.com/ideaView?id=087300000006trk