Comments on: Greylisting: A noble defeat in the spam wars http://www.hawkwings.net/2006/10/30/a-noble-defeat-in-the-spam-wars/ Tips and add-ons to make Apple Mail / Mail.app even better Mon, 21 Nov 2011 18:23:54 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Tony Meyer http://www.hawkwings.net/2006/10/30/a-noble-defeat-in-the-spam-wars/comment-page-1/#comment-31107 Tony Meyer Mon, 30 Oct 2006 20:01:18 +0000 http://www.hawkwings.net/2006/10/30/a-noble-defeat-in-the-spam-wars/#comment-31107 They need to learn a bit more about greylisting. Two points in particular: 1. greylisting still blocks probably over 90% of spam with no false positives. Any good filtering system will involve multiple techniques - this is a good, cheap, initial step. A technique doesn't have to get rid of 100% of spam in order to be useful. 2. The delay that greylisting causes gives the filterer enough time to find copies (either identical or extremely similar) of the spam from other sources (e.g. honeypots). This information can then be used when the more clever spammers do retry They need to learn a bit more about greylisting. Two points in particular:

1. greylisting still blocks probably over 90% of spam with no false positives. Any good filtering system will involve multiple techniques – this is a good, cheap, initial step. A technique doesn’t have to get rid of 100% of spam in order to be useful.

2. The delay that greylisting causes gives the filterer enough time to find copies (either identical or extremely similar) of the spam from other sources (e.g. honeypots). This information can then be used when the more clever spammers do retry

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