Ignoring the spammer is nice in theory, however we are dealing with a little
different creature than you are used to in ham radio.

The spammers we are dealing with know have found out that they can send one
message to a listserver and have it propogate to all the mailing lists.  What
they do is get the names of every listserver they can find and then send their
advertisments to all of them.  They are not reading the lists.  To expect
everyone on hundreds, maybe even thousands of lists to ignore them is
obviously unrealistic.  They don't even seem to mind if they lose their
accounts, as long as they get a few orders and make money.

My solution to the problem is as follows:

1.  Do away with mass mailings from listservers, or at least make sure it is
    the listserver admin doing them.

2.  Turn off messages from people not subscribed to the list.

3.  Have the option to send a copy of your letter back to you so you
    always see your message.

The first 2 filter out the non-dedicated spammer, the last one makes sure he
loses his account immediately by filling up his providers mail spool.

Roger