From mboxrd@z Thu Jan  1 00:00:00 1970
From: ezyang@MIT.EDU (Edward Z. Yang)
Date: Sat, 25 Jul 2009 14:10:54 -0400
Subject: [sup-talk] Reply calculation
Message-ID: <1248545266-sup-6886@javelin>

I think sup's "To" address calculation algorithm is wrong, and
messes up in some important edge-cases.  The two edge
cases I have in mind are:

* When a mailing list sends an unsubscribe/subscribe notification

* When someone posts to a mailing list with an explicit Reply-to
  header.

In both of these cases, the mail will commonly have an explicit
Reply-to header.  However, Sup will by default disregard this
header in favor for List-id, which is *wrong*.

You can guess, this has bitten me several times.

I think the correct behavior is to only use List-id when Reply-to
is not explicitly set, since List-id is "magical" whereas Reply-to
is commonly explicit.

Cheers,
Edward