We maintain five different google groups for Vert.x:

1. The Vert.x User Group - this is used for asking questions or discussing issues related to using Vert.x
2. The Vert.x Development Group - this is used to discuss issues relating to development of Vert.x official components. Please don't use this for user questions
3. The Vert.x Commiters Group - Vert.x committers are members of the Vert.x community who maintain one or more of the Vert.x official components. See https://github.com/vert-x3/wiki/wiki/Vert.x-3-Official-stack-and-component-maintainers . This group is publicly visible but only maintainers can join the group and post to it.
4. The Vert.x Commits List - this is used to collect GitHub commits from all the Vert.x 3 official projects. If you're interested in knowing what is going on in the Vert.x 3 projects you can subscribe to this list.
5. The Vert.x CI List - this contains any notifications from our CI setup (i.e. test failures).

Please don't use StackOverflow for asking Vert.x questions. The Vert.x team does not monitor SO, so your question will likely go unanswered.