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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: SMTP in distributed DOS
On Sun, 20 Feb 2000 15:57:20 EST, Adam McKenna said: > MTA's don't send bounces to host names in Received: headers, they send > bounces to RFC 822 envelope sender addresses. (At least, that's what they're > SUPPOSED to do.) Correct. But the person said we *should* bounce back to the originating IP address, which is what's logged in the Received: header. My point was that if we *did* what he suggested, *his* mail would quite possibly be broken by taking the action. I've seen a number of mail packages (PP from the ISODE comes to mind, but there's others) that refused to accept mail if they couldn't verify at message submission time that they'd be able to send back a bounce message. I'm not saying that's correct EITHER, just that there's sites that do that. The *real* fix is for everybody to refuse to accept mail from spamhauses or identified open relays. Not that *that* approach doesn't break things as well (most notably, you don't accept mail from innocent people who happen to be unlucky/unclued enough to use the same ISP as the spamhaus). If solving spam and DOS problems were simple, we'd all have gotten out our baseball bats and DONE it already..... ;) -- Valdis Kletnieks Operating Systems Analyst Virginia Tech
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