tir, 26.07.2005 kl. 10.33 skrev Stephen Carter: > >>> Tony Earnshaw <[EMAIL PROTECTED]> 07/26/05 6:32 AM >>> > >What is your (and possibly others') experience with sending bounce > >notices to spammers? In my experience, not far from all spammer > >addresses are forged, meaning either that one would get the bounce > >message back (double bounce) from one's own MTA if the spammer's domain > >didn't exist (NXDOMAIN or SERVFAIL), or from the MTA of the forged > >spammer address if the spammer's domain did exist (again double bounce). > > > >IOW, my advice at the moment would be: "Don't bounce spam". > > > >Best, > > > >--Tonni > > There's a lot of opinion on that one... I believe if your MTA accepts the > mail your duty bound (by the RFC's at least) to send an NDR, but that's > not to say you can't stop it at the MTA by never accepting it in the first > place, thereby sticking to standards and avoiding your system building > up loads of NDR's to non-existent domains that eventually time out after > 4-5 days. > I've setup a few options in Postfix that checks both the recipient address > and the senders domain, to try and assertain if at least the e-mail is sent > from a legitimate server and is being sent to a legitimate recipient. > If not, then my MTA stops the connection right there. > There is an argument though if you do this then someone can figure out > what e-mail addresses are in fact legitimate to better target your e-mail > system for spam/viruses. > > I'm no expert at all, but this works well for me, and since I implemented > these changes I also haven't received bewildered e-mails from external > users asking me why they are receiving NDR's for my local receipients > when they never sent anything to them in the first place.
Thanks for the input. I use Postfix too, and by far and away most spam senders are smtp rejected before mail is received. --Tonni -- mail: [EMAIL PROTECTED] http://www.billy.demon.nl ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ AMaViS-user mailing list AMaViS-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amavis-user AMaViS-FAQ:http://www.amavis.org/amavis-faq.php3 AMaViS-HowTos:http://www.amavis.org/howto/
