Is it possible to list additional external mailing lists associated with a SourceForge project?
It's not possible to list external mailing lists on that page, however, an alternative would be to create a wiki page that contains the external mailing list info, and/or use the "External Link" tool (which can point to any arbitrary URL) to get a new item in the navigation bar to point to the external mailing list (or even the aforementioned info page).
Chris Tsai, SourceForge.net Support
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