Allow users to customize the rules that are used for threading emails into tickets. We have a scenario where a reply or forward is sent to a distribution list, but the person who replies is in our org, but is not the requester and is not in the CC lists. Their response creates a new ticket because it fails the existing requester marker check even though the ticket ID is correctly formatted in the subject.
It would be nice to have more control over the threading behavior by creating custom rules or overriding the existing rules.
