The email list was started in February of 1998. The discussion is free and undirected, but it tends toward the style of a support group.
Volume is now quite high - often around fifty messages a day.
Finish looking through this web site to see if this really is of interest to you. Professionals whose clients or students have this condition are also welcome. Drop me a note and introduce yourself, saying clearly and explicitly that you would like to join the hypotonia discussion list. There is also an announcements-only email list which you can subscribe to if you would rather not deal with an avalanche of email from the discussion list. Instructions for joining are the same as above.