Best terminology to distiguish groups such as "debian-user" from webmail whatevers

[Richard Owlett <rowlett@access.net>]

I'm communicating with a state level peer-to-peer support group.
The national organization has a peer-to-peer "mailing list" built around 
webmail as a complement/alternative to their sponsored social media 
groups. I find the web based system unusable.

I'm so old I used an acoustic coupler when connecting to an RBBS.
How do I clearly ask the state rep if there is a traditional mailing 
list similar to debian-user.

TIA