At 11:46 AM -0600 2005-02-17, Stephanie wrote:
Maybe that third list where you do get copies back does something like Topica, something that keeps GMail from seeing it as a duplicate.
I wonder if maybe Topica changes the content of the Message-ID: header. Most mailing list software goes to great lengths to try to avoid changing this header, because this is supposed to be the globally unique id by which this particular message is known. According to the way the standards are written, if the message id changes, then it's a different message, even if everything else about the message is identical.
Mailman only changes the contents of the Message-ID: header on posts that are coming across the news-to-mail gateway, and then only because it is necessary in order to avoid various problems that have been encountered in the past.
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