Stephen J. Turnbull wrote:
announce that you're going to start discarding posts that don't satisfy From alignment, give it a week, and start doing it. That will ensure that the Sender is always in the From field. No more, and no less. I wouldn't do it, but it's a perfectly effective way to achieve what you seem to believe is ideal.
Not an option. It's not an internal list. It's a list for "outsiders" to have a single address to write to and reach several relevant people. I wish I could enforce good practices on the world, but that won't be happening any time soon.
it also doesn't take "significant resources" or thousands of emails for training (your current spambucket and INBOX will be a decent start) and you can train it on the fly as mail comes in. The only resources required are a couple of hours to install it and learn how to feed ham and spam corpuses into it, and a few minutes every so often to feed increments of ham and spam to it. You can even avoid that amount of effort by feeding the spam and ham it outputs back into it.[2] Almost certainly you can plug it into rspamd.
Sounds interesting, but seems quite unusable. Development has stopped almost two decades ago, as it seems. So it requires Python 2 and I doubt it's capable of handling Python3. Sorry, but I'm not turning my mail server into a dumpster fire.
Please stop. These claims are not going to pass on this list. We know better.[3] If you are in a special situation where they bear some resemblance to the truth, please explain. Maybe we can come up with a solution for that situation together. But they are wildly wrong in the context of Internet email in general.
Guess what, I do not care about what you think the "internet email in general" is. That's only your view point that doesn't match what I see going through my publicly addressable mailing lists. Sure, I'm not keeping books about every single mail that comes in and what it has in its headers. And sure, the vast majority of mails - that can't have a DKIM signature in the first place because of infrastructural reasons - are already accepted by whitelisting rules so they are irrelevant. At least as long as the whitelisting in rspamd keeps doing its job. The journey to that was hard enough. But still, the number of mails having at least either DKIM or ARC isn't that large. And even worse, DKIM is more common in the spam mails I have in my spam folder right now. Sure, those didn't have manipulated sender addresses, the biggest manipulation there was the almost boring method of putting whatever into the From field before the address so it would be shown as the name. But then you have badly written mail clients that make it easier with such lazy tricks to get by.
But in the end, this simply wasn't the topic of this thread. The question was if reversing at least some of the most ridiculous manipulations of emails was possible through mailman settings.