Not authoritative, but extracted from a groups.txt file at the Argonet site
(http://www.foggy.co.uk/)

argonet.acorn.assist
argonet.acorn.betabugs
argonet.acorn.binaries
argonet.acorn.misc
argonet.acorn.voyager
argonet.announce
argonet.mac.assist
argonet.mac.binaries
argonet.mac.misc
argonet.noticeboard
argonet.pc.assist
argonet.pc.binaries
argonet.pc.misc
argonet.zfc