Very true... However, spammers are definitly aggressive when it comes to finding new addresses on your server.
When I first started doing spam filtering on front-end machines, I would just relay everything to the backend. So if spammers were sending email to randomly generated accounts ([EMAIL PROTECTED]) I was not returning a 550 even though that address did not exist. As result, Mr. Bob Smith has become popular and now I can't get spammers to believe that he is gone! Now, I always explicitly relay per address to prevent this type of harvesting. -john ---------------------------------------------------- >From : David F. Skoll <[EMAIL PROTECTED]> To : [EMAIL PROTECTED] Subject : Re: [Mimedefang] Testing and dictionary attack.. Date : Fri, 9 Jul 2004 14:44:10 -0400 (EDT) > On Fri, 9 Jul 2004, Kelson Vibber wrote: > > > - Many spammers don't clean up their lists anyway. > > I was recently at an anti-spam conference. I met an e-mail admin > who ran a domain that had been inactive for two years. That is, for > two whole years, the domain "xxx.ca" had NO published MX records, and any > e-mail to [EMAIL PROTECTED] would fail. (xxx.ca is not really the domain; > I obscured it for privacy reasons.) > > Out of curiosity, the admin published an MX record for that domain. > He was *immediately* flooded with 100,000 spams/day. > > I believe this settles the discussion as to whether spammers clean > their lists. > > Regards, > > David. > _______________________________________________ > Visit http://www.mimedefang.org and http://www.canit.ca > MIMEDefang mailing list > [EMAIL PROTECTED] > http://lists.roaringpenguin.com/mailman/listinfo/mimedefang _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
