http://projects.puremagic.com/greylisting/
This is very interesting. He is defining Greylisting as similar to an automatic email acknowledgement system. However it does not involve the user. Instead it utilizes part of the SMTP RFC 821 spec that requires unknown sources of email [(ip,sender,recipeint) triplets] to "451 Please try again later". When the MTA does, the email is allowed through. He goes on to say that eventually spammers will start adapting, however greylisting used in conjunction with other methods makes adaptation very difficult. For instance, when an ip is blacklisted, spammers change ips. However doing this means they are refused by greylisting and have to exert more resources to resend mail. Cory -- Cory Petkovsek Adapting Information Adaptable IT Consulting Technology to your (541) 914-8417 business [EMAIL PROTECTED] www.AdaptableIT.com _______________________________________________ EuG-LUG mailing list [EMAIL PROTECTED] http://mailman.efn.org/cgi-bin/listinfo/eug-lug
