email-threading

Everyone knows, if you want to thread emails you use Jamie Zawinski's algorithm . But it's a new century, and there's a new messaging service. What's the best algorithm for threading status updates posted on Twitter? Things I'd definitely like it to cope with: The easy part: using in_reply_to_status_id , in_reply_to_user_id and in_reply_to_screen_name . (Incidentally, finding proper documentation of these values would be useful in itself! Such documentation isn't obviously linked to from here , for example.) Good heuristics for inferring a "reply" relationship from messages that mention a user

I've read some great online resources like http://www.jwz.org/doc/threading.html , and it seems that any email is send with a Message-ID header, then any replies to it include In-Reply-To naming that ID and Refences which can name a list of parent message id's, and email clients use this information to construct threads when viewing a list of emails in threaded view. My question is: Can a series of emails be sent to a recipient with faked headers, to make them appear in a thread without the recipient replying to them? If so, why does my attempt below not work? We have a system that sends out