Nils Kolstein wrote:

My hosting provider is running 2.1.9 so unfortunately I don't have this option. I will check with them to see if they are willing to upgrade. Last stable version is 2.1.14 so they are running behind.

2.1.9 does not have the regular_exclude_lists feature, so this is not the explanation of your issue.

Another possibility is that this is not an issue with Mailman or the host at all, but rather it is the receiving ISP or the receiving MUA that is filtering the "duplicates" because they have the same message-id.

This is not the issue of <http://wiki.list.org/x/2IA9>, but it could be related.

You could check the archives of both lists, if they both archive, to see if the post reached both lists.

Beyond that, only your hosting provider can verify from MTA and Mailman logs whether the message is in fact delivered to and processed by both lists.

-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan