Make whitelist voluntary again

We get essentially NO spam over Winlink & never have. I appreciate that others do, so a voluntary white-list is useful. But We (& others) get lots of folks writing to us from our website. They aren't in our whitelist so it's difficult for them to contact us. We publish the //WL2K back-door, but some folks don't understand. Also, it's probably not a good idea to have everyone publishing that back-door...