There are various Emacs mailing lists, described at the Emacs Savannah page.
The main ones are:
Messages advocating “non-free” software are considered unacceptable on any of the GNU mailing lists, except for the gnu-misc-discuss mailing list. “Non-free” software includes any software for which the end user can’t freely modify the source code and exchange enhancements. Please remove GNU mailing lists from the recipients when posting a reply that recommends such software.
Some of the GNU mailing lists are gatewayed to newsgroups (although the connection is occasionally unreliable). For example, sending an email to The bug-gnu-emacs list has the effect of posting on the newsgroup news:gnu.emacs.help).
Finally, we recommend reading the GNU Kind Communications Guidelines before posting to any GNU lists or newsgroups.