[saurik]

I use the term "vindictive" because the people using their spam filter in this fashion feel that they are not only training a dataset, but punishing the sender: this attitude leads to behaviors that lead to feature creep on the usage of flagging things as "spam", and if you read threads related to spam you find people using the filter to mark all kinds of things they don't like, including business models they take issue with that really have nothing to do with email at all. I thereby simply think your entire rant here is nothing more than self-rationalization of behavior you know is overstepping a boundary: email is not "war", the attitude you are describing is objectively "vindictive", and I frankly find it rather disappointing that you just don't get this.

And again: I don't send email from my service; I don't even send receipts... so most i your rant is fundamentally mistargetted. I am a user who doesn't appreciate people's emotional responses to something that isn't really fixable anyway making email fundamentally more complicated as a protocol, breaking use cases like shared mailing lists (see the recent issues with Yahoo DMARC on the IETF list), and mis-training spam filters. If you ask me about real-life "actual" criminals I would frankly have similar responses against people who prefer vigilante, vindictive punishment for behaviors they dislike :/.