Date: Wed, 26 Nov 1997 10:04:31 -0800 (PST) From: "Jonathan M. Bresler" <jmb> To: mark@grondar.za (Mark Murray) Cc: jmb@FreeBSD.ORG, jkh@time.cdrom.com, grog@lemis.com, chat@hub.freebsd.org Subject: Re: major push by spammers? Message-ID: <199711261804.KAA05780@hub.freebsd.org> In-Reply-To: <199711261800.UAA01100@greenpeace.grondar.za> from "Mark Murray" at Nov 26, 97 08:00:36 pm
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Mark Murray wrote: > > "Jonathan M. Bresler" wrote: > > > The stuff in FreeBSD's sendmail rules workds well, no doubt about that, > > > but it is not failsafe. If your DNS is a bit slow, you can lose mail. > > > > hmm....not sure that i agree with you. > > if w are slow to resolve, the error code is 451, a temp error, > > meaning try again later. the spammers databases dont use DNS. > > and RBL is failsafe.....so can you explain it to me? > > > > i dont understand. > > I'm looking at the rules again, and I'm confused. I have seen > legitimate mail from freebsd/hub.freebsd.org being bounced with a 500 > code when DNS was ropey. I cannot figure out this happened from the > rules I have. I'll go with mea culpa unless proven otherwise :-). please send me the log entry if you have it. hub.freebsd.org should not be rejecting mail due to dns with 500 series error codes, but rhater should be using a 451 error code > > I meant: > > The ruleset that I have (committed by Peter?) looks up the domain of > incoming mail. if it does not check, the mail is rejected. If the DNS > does not answer in time, the mail is bounced for the same reason. its not bounced, its tempoararily not-accepted ;) meaning the server should try to deliver again later. i should know i wrote those rules, after looking at what others were doing. > > Vixies RBL works in reverse; the spammer's IP is checked on connection. > If the RBL resolves the IP (PTR-style) to 127.0.0.2 then the mail is > rejected. If DNS fails, the mail is accepted by default. right.....so default you eat spam <gack!> jmb
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