The Fedora Council uses two mailing lists.
council-discuss (formerly "board-discuss") is a public list. Subscription is open to anyone, as are the archives. This list is the main discussion point for the Fedora Council, and the goal of the list is to either reach a decision, or to delegate the thread to a more appropriate location. For example, engineering-specific threads may get some comments on council-discuss, before being redirected to the devel list for in-depth discussion.
council-private is a private list. Its membership is restricted to the current Council members, and its archives are private. This list is only used for topics that cannot be discussed on the public council-discuss list.
Council members are also often present on the #fedora-council IRC channel on irc.freenode.net
If you have an issue to be worked on by the Council you can also open a ticket on the Council Pagure instance. This is a public issue tracker. However, if you have a particularly privacy- or security-sensitive issue, you can check the Private box when you create the ticket. If an issue is not sensitive the discussion should be in the open, in the public Pagure instance or the council-discuss list.