Vinayakam Murugan wrote:
Not with any of the mail clients that I use. Pine, Mutt and Thunderbird all support threads, very well in fact.
So do KMail and Gmail.
Kmail does. Gmail doesn't. Gmail tries to guess threads based on message contents rather than relying strictly on the In-Reply-To: MIME header. As a result, Gmail groups messages with the same subject into a thread even though they are not from the same thread.