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That's a problem (or maybe a misconception) with Nabble. It pretends to be a forum where you can actively post instead of writing an email to the mailing list. Nabble will then try to send a corresponding email to the list.

But the mailing list will only accept email from subscribed members. Someone posting through Nabble may not be a member, and the mail will bounce.

Maybe a big warning like on http://www.pcl-users.org could help?