On 07/28/2011 04:19 PM, Marc Deop wrote: > This discussion makes no sense to me. If the email client is using the subject for threading it is doing something wrong (or you specifically set it that > way). > > As Ken said, there are headers used to organize the emails. the thing is that not all mail clients will set the in-reply-to headers, whuch is why clients like thunderbird, evolution and mutt will use the subject line as well to thread messages. - KB