I found the following on the intro page for a mailing list which shall remain nameless:
We welcome all new members who have an interest in hiking and the outdoors, and feel free to post messages pertaining to the outdoors. However, in an effort to control spam and spammers, I'll be reviewing all messages and requests for membership before they are approved / posted. Sorry it had to come to this.
T-shirts showing the above "Chat Free Or Die!" logo are available at our cost.