I just subscribed to this list, and it seems the mail server does not
insert any headers to indicate what list this is.  Most lists will
typically insert headers like:

   Precedence: bulk
   X-BeenThere: procmail AT lists.RWTH-Aachen DOT DE
   X-Mailman-Version: 2.0.12
   List-Post: <mailto:procmail AT lists.RWTH-Aachen DOT DE>
   List-Subscribe: <http://MailMan.RWTH-Aachen.DE/mailman/listinfo/procmail>,
           <mailto:procmail-request AT lists.RWTH-Aachen DOT 
DE?subject=subscribe>
   List-Unsubscribe: <http://MailMan.RWTH-Aachen.DE/mailman/listinfo/procmail>,
           <mailto:procmail-request AT lists.RWTH-Aachen DOT 
DE?subject=unsubscribe>
   List-Archive: <http://MailMan.RWTH-Aachen.DE/pipermail/procmail/>
   List-Help: <mailto:procmail-request AT lists.RWTH-Aachen DOT DE?subject=help>
   List-Id: discussion of the procmail program <procmail.lists.RWTH-Aachen.DE>

X-BeenThere is the most common approach.  Because I need something to
key on for mail processing, I thought about cancelling my subscription
and signing on through Yahoo Groups, which uses a common header format
for all its lists.  The problem is that Yahoo Groups only offers a
digest version of amanda-users.

How are you folks handling it?