We know of one mailing list devoted to the Viola da Gamba. Here are the details:

Yahoo group

An older list, the "Sandwich" list, was closed on August 8 2014.

Facebook is a wonderful resource to connect with other viol players! There are two open groups you can join:

both of which can connect you to the goings-on of viol players near and far, as well as keep you appraised of important concerts, workshops, events, etc. in the greater viol community. Also feel free to "like" the VdGSA on Facebook for updates from the Society!