Julian Mehnle writes:
There is no such document.
Jo Rhett keeps talking about "technical problems". Well, conformance to a published standard is a technical problem. Deciding what to do in the absence of such a standard is not, and you tell us there isn't one.
But I can tell you this for sure: Ian Eiloart demonstrated a lot of goodwill toward Mailman when he provided about a half-dozen URLs. Can you justify (to yourself!) doing less?
However you know that it's a mortal sin when you end up on several blacklists (and rightly so!) for having sent backscatter to innocent bystanders.
Oh, brother! Look up "vigilante", and meditate on the definition until you realize that those are the words of a vigilante.
The point is that there's a big difference between blacklisting somebody like me, who has participated in this thread and followed past discussions of backscatter, and blacklisting some poor Ubuntu user, who just installs Mailman and creates a few lists because it says on the homepage that it tries to conform to the RFCs on mailing lists and provides some antispam features, and expects that it will therefore DTRT.
The first is both necessary (hypothetically) and right (if necessary), but while the second may be necessary, there's no way it's right.
Footnotes: [1] http://www.trumanlibrary.org/buckstop.htm