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How do I let a few specified non-subscriber email addresses post to an otherwise closed GNU Mailman mailing list?

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I finally figured out how to do this!

Go to the list's Privacy Options, click on Sender Filters, then add the emails to the option called accept_these_nonmembers.

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I'm not familiar with Mailman itself, but an external workaround would be to give them a dummy address to send to that will auto-forward to the list on their behalf. The dummy account can be a 'Subscriber", and restrict incoming mail to only accept from your desired contributors.

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