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I just noticed that this topic: [African Wikimedians] Greetings and introduction - Rudolph Ampofo, Sub-Saharan Africa Partnerships Manager - WMF could not be replied to. Is that by design or a bug?

I noticed the same a while ago but then made a search to find this blog post, where it is clarified that mirrored messages from the mailing lists are read-only. You can also verify this if you check the general introduction to the mailing lists categories: