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
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