NFN Smith wrote:
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.
What I've seen a lot is that people tend to post to news with clients that also send out a copy by e-mail, and the mailing list is configured to gateway articles back to the newsgroup, thus resulting in duplicates.
Another source of duplication is if you have multiple people operating mail-to-news gateways.
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.
INN does rely on the Message-ID to track whether or not it has seen this particular message, but an article being gatewayed in via USENET should not then be gatewayed back out to USENET by Mailman. The pipeline of routines within Mailman should be set up to avoid precisely that condition.
However, see FAQ 4.59 at <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq04.059.htp> for the reasons why Mailman modifies the Message-ID header on incoming USENET news.
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