On 25.6.2013, at 16.52, Reindl Harald h.reindl@thelounge.net wrote:
Am 25.06.2013 15:28, schrieb Timo Sirainen:
Also there are several potential problems.. Like if there are duplicate Message-ID: headers, but the body is different, should that be a duplicate?
the answer is simply *yes* because there must not be the same Message-ID's for different messages because the words "single unique message identifier" are pretty clear
I'm more concerned about intentional abuse. For example if you're dropping duplicate messages by Message-ID, I could first send this reply to you privately, and then another message with same Message-ID: but different content to the mailing list, and you'd never know it without looking into the archives from web.
Also I wouldn't be surprised if there still were some crappy webforms that always sent the same Message-Id..