Ruth Ivimey-Cook writes:
Does Mailman3 keep such stats, and if so is there any way to get access to them, even if only API? I would think it useful to do so (and yes, for individual outgoing messages at least for a period).
In released versions, it currently does not, as far as I know. This kind of thing should be available from your MTA, of course, and I think there was a visceral opposition to keeping track of people's behavior that way from the early days. So those are our excuses.
However, it's something that comes up occasionally on the list as well as as a GSoC proposal, and I think there's some code on a branch for this that Abhilash has been threatening to release. And of course HyperKitty now publishes stats on posting behavior. So there's really no reason to oppose it, now it's just a matter of time to implement.
Abhilash's participation has been kind of spotty recently (and apologetic about it, he's not going anywhere), but hopefully he'll pick up the thread shortly and at least confirm or deny what I wrote here.
Steve