As proposed previously[1], this list is now being phased out. Alternatives are:
StackOverflow (
http://stackoverflow.com/tags/sbt)
General questions should be asked on StackOverflow. This should be the default choice for questions that likely have a definitive answer.
[sbt-dev] mailing list (
https://groups.google.com/forum/#!forum/sbt-dev)
Focuses on development of sbt and sbt plugins: discussions of features, bugs, and changes to sbt.
IRC (#sbt)
General questions, discussions, etc...
Issue tracker
See
https://github.com/sbt/sbt/blob/0.13/CONTRIBUTING.md#new-issues
Concretely, this list will become read-only in 1 month. If you have open threads that fall under the topic of [sbt-dev], please repost them there. Unanswered questions should go to StackOverflow. If unsure, just bump your thread on this mailing list.
The documentation will be updated shortly (the CI job to refresh docs is currently running). I will probably try to subscribe this list to [sbt-dev] to increase awareness of it.
Thanks,
Mark
[1]
https://groups.google.com/d/topic/simple-build-tool/JWh5bSUrnck/discussion