Spam filtering is at least something I should be able to tackle in a somewhat reliable way. I am worried about telling outsiders from insiders, there are many w

Spam filtering is at least something I should be able to tackle in a somewhat reliable way. I am worried about telling outsiders from insiders, there are many ways projects go about organizing their contributors! Some use GitHub organizations and give contributors membership (easy to tell apart) some others invite to collaborate via giving access rights (also easy) but some others do neither of those things.