More TMDA/antispam fixes

I found tonight that Postfix was doing enough undocumented header
rewriting to poke holes in the TMDA filter, which let a few spam
messages through yesterday.  This was also the cause of some folks not
having their messages make it to the list (the confirmation messages
were being sent to the inappropriately munged envelope header, and not
to the original sender).

All should now be well.  Complain if something isn't working (in the
mail list system that is :-)

Monty



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