Auto-reject non-member messages?

I just took over administering a list and get a few spam messages to the list from non-members. I looked at the available information and couldn't figure out how to set the list admin controls to automatically reject any message to the list from a non-member. We're a small group with a tightly controlled membership so it won't be a problem to just blanket reject messages from non-subscribers. Thanks for your help.
Mike
-- Mike Starr Technical writer

Mike Starr wrote:
Privacy options...->Sender filters->generic_nonmember_action
Discard is better than Reject unless you feel you might receive non-member posts for which it is important to respond in some way, i.e. some legitimate request from a non-member who would assume the request was received in the absence of a negative reply.
-- Mark Sapiro <msapiro@value.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

At 9:47 AM -0800 2/23/07, Mark Sapiro wrote:
Whereas I would turn that around and say that Reject is better than Discard, because it's generally better to notify legitimate senders that their post was rejected as opposed to simply throwing it away silently.
Of course, this method can lend itself to certain other types of abuses (e.g., Joe Jobs), although Mailman does work hard to try to mitigate those.
-- Brad Knowles <brad@shub-internet.org>, Consultant & Author LinkedIn Profile: <http://tinyurl.com/y8kpxu> Slides from Invited Talks: <http://tinyurl.com/tj6q4>

Mike Starr wrote:
Privacy options...->Sender filters->generic_nonmember_action
Discard is better than Reject unless you feel you might receive non-member posts for which it is important to respond in some way, i.e. some legitimate request from a non-member who would assume the request was received in the absence of a negative reply.
-- Mark Sapiro <msapiro@value.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

At 9:47 AM -0800 2/23/07, Mark Sapiro wrote:
Whereas I would turn that around and say that Reject is better than Discard, because it's generally better to notify legitimate senders that their post was rejected as opposed to simply throwing it away silently.
Of course, this method can lend itself to certain other types of abuses (e.g., Joe Jobs), although Mailman does work hard to try to mitigate those.
-- Brad Knowles <brad@shub-internet.org>, Consultant & Author LinkedIn Profile: <http://tinyurl.com/y8kpxu> Slides from Invited Talks: <http://tinyurl.com/tj6q4>
participants (4)
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Brad Knowles
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Mark Sapiro
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Mike Starr
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Patrick Bogen