On Thu, Mar 30, 2000 at 02:17:55AM +0200, Nils Jeppe wrote: > On Thu, 30 Mar 2000, Craig Sanders wrote: > > > DUL is very effective in doing that. it prevents spammers from > > hiding their activities from their ISP...which ensures that they > > will be caught and their account nuked very promptly. > > Okay, I see this point, however, I do have a problem with the > categoric blacklisting of IPs just because they're dialup.
i can see why you have a problem with that and i would agree with you if there weren't any alternatives. however, as has been mentioned many times, there are several alternatives, including (but not limited to) the following: a) use the ISP's mail relay b) use uucp-over-tcp (requires uucp account somewhere) c) use smtp-over-ssh (requires shell account somewhere) d) pop-before-smtp or SMPT-Auth or SSL certificate relaying (requires mail account somewhere) using the DUL is like a "no junk mail" sticker on your letter box...if someone wants something delivered to your letter box they have to go through the normal channels to do so (i.e. pay the postage). i don't know about other countries, but here in Australia it is illegal to ignore a "no junk mail" or "addressed mail only" sign on a letterbox. > > that's the medium-term indirect effect of DUL...the immediately > > beneficial direct effect is that spam from dialup users is blocked by > > anyone who makes use of the DUL. > > Well, hmmm, only direct spam, but you are right. DUL and ORBS do make > for a quite potent combination. personally, i don't use ORBS - too much collateral damage. i use MAPS RBL, MAPS RSS, and MAPS DUL...they make a very effective combination. > I just realized this would also take care of that VERY annoying kind > of spam where spammers send spam directly to the 2nd highest MX record > in a zone. That mailserver looks at the MX and thinks, hey, not for > me, but I'm a fallback, let me just forward this, and my MTA thinks > hey this is from my fallback, I trust that guy. yep, as long as the secondary MX uses the DUL that will work (and the other RBLs too). craig -- craig sanders
