I (bullet-) vote for a firm yet friendly and humane version of option c.
Reject any non-list-member message, but insofar possible in your rejection response tell the sender:
(1) 'You must join the list in order to post to it.'
(2) How to start joining - where to go, what to do.
(3) In case you liked the message, add something like: 'Your message seems to be of real interest, so I encourage you to join the list and then re-post your message.'
Joe Weinstein
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