The other point being made is that this system is already going to attract
a significant ammount of attention. Open ports. whther proxied to some
sense of security or not, is going to attract a tad bit more attnetion in
and of itself. That and the fact that mailing list software tends to
present it's own set of administrative issues, with which errors are easy
to surface and likely be exploited. Added services only hieghten the
potential. There is the possibility this system might well attract more
attention then was assumed/wanted/warranted.