Received from Shal Farley at 1/10/2019 06:58 AM UTC:
If you mean that you edited the messages while pending, I've had mixed results with that. If the incoming messages have In-Reply-To fields in their headers that may derail your edit attempt.
A "proper" email client/interface will delete the In-Reply-To and References headers in a reply if the sender changes the subject line... thus making that message the first message in a new thread (topic) if threading is based on In-Reply-To and References headers.
Jim H
