[Mailman-Users] Looking for the reverse of a "ban list"

[Scott C. Villinski]

I'd like to configure a set of domain names that are allowed to 
subscribe to lists.  It could be the equivalent of a Ban list with some 
domain names as exceptions.  Or just an "Allow List".  Any thoughts?  I 
saw in the archives the messages about allow lists for sending messages 
- but I don't think this will help me.

Thanks,

Scott