There are two mailing lists related to Snowball:
is a list for general discussion of anything Snowball related. Release
announcements will also be posted to this list.
is a readonly list. Whenever a change is made to Snowball, a message will
automatically be sent to this list: it is therefore fairly high volume, and
only of interest to people actively working on Snowball.
(You can subscribe to the lists by following the appropriate links above.)