The ISP-Caching list is designed to focus its discussion on caching systems. Conversation encompasses Squid type software, proxy server solutions, new satellite caching systems, or any new caching system that is just being released. ISPs who want to save money by maximizing bandwidth capacity will be benefit in joining the discussion on the ISP-Caching list. List traffic tends to be bursty, and is often controversial. Advertisements are appended to every message.
The squid-users focuses primarily on Squid, but sometimes topics include general caching issues. Traffic is approximately twenty messages per day.
TERENA's TF-CACHE list is open to anyone. This is a relatively low volume list, with usually just a few messages per week.
The IETF WREC working group's mailing list is maintained by the University of Tenesee at Knoxville. To subscribe, write to email@example.com. The list is also archived as well. Volume is bursty, with quite a lot of activity before and after IETF meetings.
IRCache has a mailing list, but its pretty dead these days. The subscription address is firstname.lastname@example.org.
The ausproxy list is targeted to Australian Web cache administrators. The subscription address is email@example.com.