In pgrouting-dev, @kalxas tried to reply to an email I sent directly to him and he did cc: pgrouting-dev@discourse.osgeo.org, however the email was rejected by discourse because, the title was already used.
I think we should turn this off, but haven’t figured out where the setting for this is.
I was able to turn it off for trac_osgeo@osgeo.org mail (that flows into SAC tickets - OSGeo Discourse category, by ticking the box “Category Mirrors a mailing list”, but seems a bit unintuitive to have to do that, though maybe that is the solution.