Side-wide whitelist

[Josh Triplett]

Many lists only allow subscribers to post. On these lists, people often subscribe so they can post, but disable delivery so they don't receive all the (potentially high-volume) list traffic. In general, someone who has gone to the trouble of subscribing to one list at a site often qualifies to post to any list at that site, but mailman does not make it trivial to implement such a policy. A few mailman installations have custom patches for this.

I'd like to have the ability to trivially (as in "check a checkbox") implement the following policy with mailman:

- Allow posting from anyone subscribed to any list on this site, or whitelisted for any list on this site.

This would also, as a side effect, allow a dummy list to serve as a place to subscribe for whitelisting purposes only. (See http://lists.debian.org/whitelist/ for an example of such a list.)

I can imagine that some people might want to specify a specific list for use in whitelisting, rather than any list on the site, though I personally don't care about that variation.