[plug] threading by subject (was: pine)

[Leon Brooks]

On Fri, 21 Sep 2001 13:43, Matt Kemner wrote:
> About the Fri, 21 Sep 2001 message from Bret Busby:

> P.S. can you please include a subject when you send a message to the list?
> It makes sorting threads a lot easier if there's something to sort on. :)

Just use collating equivalence between subject-empty-after-optional-list-tag 
and message-does-not-exist. No worries. (-: