In 2004 I started two email lists, one for AGI discussion and the other for Singularity discussion. These are still rolling along, but the subscribe/unsubscribe page for them was on another website that went offline years ago. I have finally put a new subscribe/unsubscribe page for the lists online, see http://wp.goertzel.org/email-lists/
The AGI list is co-administered and moderated by John Rose; the Singularity list is co-administered and moderated by Giulio Prisco and Amara Angelica from Kurzweilai.net
Mailing lists aren’t as important in the Internet ecosystem as they once were, given the explosion of social networks of various forms; but IMO they still fill a useful role. Social network sites come and go but email has been around a while and probably isn’t going anywhere, though it may adopt various forms….