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+To: Jamie Zawinski <jwz@jwz.org>
+Subject: message threading
+
+Hi,
+
+I'm implementing message threading, and have been referencing both
+your document <https://www.jwz.org/doc/threading.html> and RFC 5256.
+I'm not sure whether you're interested in updating a document that's
+more than 25 years old, but if you are: I hope you find the following
+feedback valuable.
+
+You write that the algorithm in RFC 5256 is merely a "restating" of
+your algorithm, but I noticed 3 (minor) differences:
+   
+1. In your step 1.C, the RFC says to check whether this would create a
+   loop, and if it would to skip creating the link; your version only
+   says to perform this check in step 1.B.
+   
+2. The RFC says to sort the messages by date between your steps 4 and
+   5; that is: when grouping by subject, containers in the root set
+   should be processed in date-order (you do not specify an order),
+   and that if container in the root set is empty then the subject
+   should be taken from the earliest-date child (you say to use an
+   arbitrary child).
+
+3. The RFC precisely states how to trim a subject down to a "base
+   subject," rather than simply saying "Strip ``Re:'', ``RE:'',
+   ``RE[5]:'', ``Re: Re[4]: Re:'' and so on."
+
+Additionally, there are two minor points on which I found their
+version to be clearer:
+
+1. The RFC specifies how to handle messages without a Message-Id or
+   with a duplicate Message-Id (on page 9), as well as how to
+   normalize a Message-Id (by referring to RFC 2822).  This is perhaps
+   out-of-scope of your algorithm document, but I feel that it would
+   be worth mentioning in your background or definitions section.
+
+2. In your step 1.B, I did not understand what "If they are already
+   linked, don't change the existing links" meant until I read the
+   RFC, which words it as "If a message already has a parent, don't
+   change the existing link."  It was unclear to me what "they" was
+   referring to in your version.
+
+-- 
+Happy hacking,
+~ Luke T. Shumaker