On Wed, Sep 05, 2012 at 06:41:44AM -0400, Lee Haefele wrote: > Doesn't the liveaboard list have a spam filter? My spam filter > rejects mail from a server that does not match the e.mail address.
Unfortunately, that approach won't work here. [...] Received: from elasmtp-junco.atl.sa.earthlink.net (elasmtp-junco.atl.sa.earthlink.net [209.86.89.63]) by sun2.highwayusa.com (8.13.7+Sun/8.13.7) with ESMTP id q8535x6M003495 for <Liveaboard@liveaboardonline.com>; Tue, 4 Sep 2012 23:06:00 -0400 (EDT) Received: from [188.26.185.39] (helo=localhost) by elasmtp-junco.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from <banders...@earthlink.net>) id 1T963w-0000uS-LC for Liveaboard@liveaboardonline.com; Tue, 04 Sep 2012 23:13:58 -0400 Date: Wed, 05 Sep 2012 05:24:36 -0600 [...] That bottom transaction (which is the first one in the chain) is where the spammers passed their garbage to Earthlink - and the Earthlink server accepted it based on the "envelope-from" address. After that, it's all valid exchanges up the chain - no way for the list server to know that it's spam. If all servers validated the "envelope-from" addresses against the sending IP at transaction time, the spam problem would disappear immediately. The mechanisms to do this are in place (all major servers such as Google use so-called SPF records), but... there are millions of mail servers in the world, and 99%+ of them are *not* run by technically-competent people. Ben -- OKOPNIK CONSULTING Custom Computing Solutions For Your Business Expert-led Training | Dynamic, vital websites | Custom programming 443-250-7895 http://okopnik.com http://twitter.com/okopnik _______________________________________________ Liveaboard mailing list Liveaboard@liveaboardonline.com To adjust your membership settings over the web http://liveaboardonline.com/mailman/listinfo/liveaboard To subscribe send an email to liveaboard-j...@liveaboardonline.com To unsubscribe send an email to liveaboard-le...@liveaboardonline.com The archives are at http://www.liveaboardonline.com/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/liveaboard@liveaboardnow.org The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html