GIS listservs allow subscribers to communicate with other members of the list via email. The following listservs may be of interest to you
GIS4LIB - Created and maintained by the University of Washington, this listserv is an email list for discussion of issues relating to geographic information systems (GIS) and libraries, whether academic, private, corporate, etc.
Email subscription address: http://mailman2.u.washington.edu/mailman/listinfo/gis4lib
Esri-L/ArcView-L –Two software-specific lists created and maintained by Esri.
Email subscription address:
http://support.esri.com/index.cfm?fa=listserve.listserve
GIS@listserv.uta.edu – Created and maintained by the University of Texas at Arlington. This is a discussion list for all topics relating to GIS
Email subscription address: http://listserv.uta.edu/cgi-bin/wa.exe?A0=GIS
Maps-L – Created and maintained by the University of Georgia to discuss mapping and other topics in the discipline.
Email subscription address: http://www.listserv.uga.edu/archives/maps-l.html