Active Zope 2, Zope3, and Zope Toolkit developers should subscribe to the zope-dev mailinglist.
Developers who work actively on the zope2 Launchpad project should either subscribe to the zope2-tracker notifications mailinglist (this list receives notifications from Launchpad for each updated bugtracker issue in the zope2 project), or ask to be added to the zope2-dev team on Launchpad.
Grok developer should subscribe to the grok-dev mailinglist.
BlueBream committers should subscribe to the bluebream mailinglist.
Depending on your interest you can subscribe to other Zope mailing lists as well:
http://mail.zope.org/mailman/listinfo