Date: Wed, 26 Nov 1997 17:41:32 +1030 From: Greg Lehey <grog@lemis.com> To: "Jordan K. Hubbard" <jkh@time.cdrom.com> Cc: "Jonathan M. Bresler" <jmb@FreeBSD.ORG>, chat@hub.freebsd.org Subject: Re: major push by spammers? Message-ID: <19971126174132.22911@lemis.com> In-Reply-To: <18154.880528164@time.cdrom.com>; from Jordan K. Hubbard on Tue, Nov 25, 1997 at 11:09:24PM -0800 References: <19971126173214.61195@lemis.com> <18154.880528164@time.cdrom.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Nov 25, 1997 at 11:09:24PM -0800, Jordan K. Hubbard wrote: >>> Try turning on reverse DNS filtering and you'll find that this number >>> goes WAAAY up. According to my stats just for time.cdrom.com, I've >>> rejected 2203 spam attempts since 9am this morning. Yep, that's >>> correct - approximately 2.8 spams rejected every minute. >> >> Wow. You must have annoyed somebody :-) > > No, I'm just stupid enough to post to USENET using my real mailing > address. :-) Isn't that the same thing? >> How are you recognizing the spammers? > > 2 ways: The first, if reverse DNS lookup fails, accounts for about 90% > of the rejects. When I first started doing this, I worried that > perhaps I was rejecting some legit emails so for the first couple of > weeks I'd do one day on, one day off. In 14 days worth of testing, I > got one "legitimate" message (though it was unanswerable due to said > misconfiguration, so I could have done without it :) and many many > hundreds of spams on the days that I had reverse DNS checking > disabled. Needless to say, I can't even imagine not having it on now. > > The second way, which accounts for that last 10%, is to reject > according to a ban list which is maintained by the folks at gulf.net > (to which we add our own local banlist). Hmmm. If I ever get this book finished, I suppose I should take a look at this. Greg
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19971126174132.22911>