https://wiki.swcp.com/w/index.php?action=history&feed=atom&title=KB_437 2026-10-06T22:08:17Z Revision history for this page on the wiki MediaWiki 1.45.1 https://wiki.swcp.com/w/index.php?title=KB_437&diff=30&oldid=prev 2008-05-22T21:55:42Z

<p>New page: ===Why can&#039;t you guys just filter out the spam!=== Article ID: 437 Created: Aug-30-2006 ====Question or Symptoms==== It&#039;s easy to recognize, what&#039;s the big deal? ====Resolution...</p> <p><b>New page</b></p><div>===Why can&#039;t you guys just filter out the spam!===<br /> Article ID: 437<br /> Created: Aug-30-2006<br /> ====Question or Symptoms====<br /> <br /> It&#039;s easy to recognize, what&#039;s the big deal?<br /> <br /> ====Resolution====<br /> <br /> 1. Humans pattern match really well.<br /> Here are two examples to think about in how you&#039;d tell a computer to<br /> recognize them:<br /> -------------------------------------------------------------------------<br /> <br /> Aoccdrnig to a rscheearch at an Elingsh uinervtisy, it deosn&#039;t mttaer in<br /> waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht frist<br /> and lsat ltteer is at the rghit pclae. The rset can be a toatl mses and<br /> you can sitll raed it wouthit porbelm. Tihs is bcuseae we do not raed ervey<br /> lteter by it slef but the wrod as a wlohe.<br /> <br /> ------------------------------------------------------------------------<br /> \/1agr@<br /> <br /> V`agra V1agra V iagra v`aGra `/1agra vi@gr@ v i a g r a<br /> vi agra via gra vi ag ra V1 @g ra V.I.A.G.R.A.<br /> __ __<br /> \\ //&#039; /\ | _+ |__| /\<br /> \/ | /--\|__| | \ /--\<br /> <br /> And these are just using plain ASCII text.<br /> ------------------------------------------------------------------------<br /> 2. The spammers use the same tools we use to fight spam as test beds<br /> to craft spam. They have the same Bayesian filters, the same Spam<br /> Assassin pattern lists, the same virus signature databases and are<br /> updated in the same timely manner of new methods to catch spam.<br /> The difference is it&#039;s often their full time job to craft spam that<br /> can get through the current technology&#039;s filters, where as the folks<br /> fighting spam have fewer resources.<br /> <br /> ------------------------------------------------------------------------<br /> 3. We have to deliver ALL your desired mail, NONE of the spam, AND<br /> we have to do it in a timely fashion. Here are some ways a message<br /> can be delayed.<br /> <br /> Did it get caught in the queue of one of our front end spam filtering<br /> appliances?<br /> <br /> Was it stuck behind hundreds of thousands of bounced messages sent<br /> offsite with a legal SWCP/NMIA/Thuntek email address as its reply-to?<br /> <br /> Was the mail server under a dictionary attack of an army of zombies<br /> controlled by a spammer trolling for valid email addresses?<br /> <br /> Were our anti-virus machines hobbled by a carefully crafted poison<br /> pattern embedded in a virus?<br /> <br /> This certainly doesn&#039;t mean we&#039;re surrendering in this war against spam!<br /> We&#039;re constantly trolling for new ways to filter without throwing out<br /> the good stuff. About every six months we beef up our email system by<br /> buying new machines and/or re-engineering our email systems.<br /> It&#039;s an unending war but we&#039;re committed to trying to deliver all your <br /> desired email fast and spam free.</div>

Jamii