----- Original Message ----- From: "Toralf Lund" <[EMAIL PROTECTED]> To: "Exim Mailing List" <[email protected]> Sent: Friday, July 06, 2007 10:59 AM Subject: Re: [exim] Sender callout verification with warning only
> > > > > Do you realise that callouts are considered abusive in anti-spam circles and > > are often used in certain forms of ddos attacks ? Some major mail servers > > even BLOCK based on the number of callouts they receive from a given IP. > > Something like 80% of emails are spam, so 80% of your callouts are being > > directed at totally innocent machines. Challenge response methods should be > > considered in the same way. > > > I tend to consider them as a way of reducing spam, and everything that > does is for the Greater Good, IMO. Also, I'm quite happy to receive this > kind of requests at our server, so I'll happily use them myself - > according to some principle we read in some holy book or the other at > school... You obviously haven't received 100,000+ or more of them in one day because some spammer was forging the FROM from a domain that host. NO it is NOT for the greater good, and would block only a tiny %age of spam. Firewalling the entire world would also be good for blocking spam - doesn't mean its a good idea. Try reading some of the articles on http://www.google.co.uk/search?hl=en&safe=off&q=callouts+abusive+behaviour+spam&meta= - especially the ones on NANAE Taking the attitude of "it doesn't hurt me and sod the rest of the world" is akin to "my machine has a virus but it still works fine - why should I worry". All the best Phil _____________________________________________ Website Hosting from only £5.00 per month. www.medwayhosting.com - +44 (0)1634 856965 _____________________________________________ Digital & Traditional Printing, and much more www.medwayprint.com - +44 (0)1634 281199 _____________________________________________ -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
