The last two are unrestricted, which I find extremely surprising. Possibly PEBKAM but I very much doubt that I made the chandler-dev forum, where the spam was found, a free-for-all.
Nabble, please, can you triple-check that the recent change to the UI (and the back-end) relating to access privileges is not breaking access restrictions in some cases?
Not only spam; privacy (of private forums) is a greater concern.
Thanks
Graham
Postscript: I have changed the restriction, to members only, on all three of 1653096, 1653123 and 1658350.