I'm not sure if this is a problem with Mailman or INN, but I'll start on the Mailman side. If it's an INN problem, I'll be happy to redirect my question to the appropriate forum.
I'm in the process of adding a news/mail gateway to a server that's running Mailman 2.1.9-7 on a Debian 4.0 box. I'm adding INN 2.4.3-1 . Both Mailman and INN are installed from the Debian Stable channel.
Where I'm having problems is with messages posted from the news side -- they're gated into Mailman, and distributed correctly to mailing list subscribers, but then a copy of the message goes back through to the INN server, and INN isn't recognizing the message as having been seen, and the result is that the news side of thing sees a duplicate copy of the message.
On further inspection, the duplicate message has clearly been submitted to news by Mailman, and includes lots of Mailman-specific headers. In particular, the Message-ID: header is rewritten by Mailman, and I'm assuming that INN relies on Message-ID: to track what has been seen or not.
This is happening with nearly all the mailing lists configured to be gated to news on this server, with the exception of one list, where I'm not getting dupes. This implies that the difficulty is specific to the configuration of individual lists, but I can't see any difference in configurations on either Mailman or INN between the list/newsgroups that are getting duplicates, and the one that isn't.
It looks like I'm missing something small, but I'm not seeing it.
Any clue as to where I should start looking?
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