German HCI researchers
The best mailing list to reach the German HCI community is the open mailing list maintained by the German Computing Society Special Interest Group on HCI:
See http://fb-mci.mensch-und-computer.de/community/mailingliste/ for more information on this list and on other mailing lists in the German HCI community.
SIGCHI German Chapter
ACM SIGCHI maintains two mailing lists for reaching the officers and the (official) members of the SIGCHI German Chapter: