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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 11:59:42 PST, I Am Not An Isp <[email protected]> said: > This is the problem - a mail server stupid enough to send a bounce to an > unverified host name, instead of the connecting IP address. Stupid or not, that's required by the RFCs. Take a look at this mail, the original From: points at 'vt.edu', which is MX'ed to mail.vt.edu. However, that's NOT the address that the NANOG mailing list is receiving this mail from. For that matter, did the mail from 'ianai.net' arrive at the NANOG mailing list *from* ianai.net? I see this in the headers: Received: from pgilmore (PIX46.pgexch.com [208.217.23.46]) by pyrite.eod.onyx.net (8.9.3/8.9.3) Hmm.. Must be spam we should have rejected, since there's a case to be made that you shouldn't accept mail you can't send a bounce message back to, and your mail obviously came from an unverified IP address... Be careful what you ask for, you may get it... -- Valdis Kletnieks Operating Systems Analyst Virginia Tech
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