Pre-Filtering The Spam
from the how-many-filters-needed? dept
My anti-spam system now uses a variety of server and client side filters to help keep the damn stuff out of the inbox. Now, some are suggesting an even earlier level "pre-filter" for spam. HP Labs has made a fairly simple discovery that even without various email authentication systems, it's pretty easy to get a quick determination as to whether or not an email is spam. The system they developed looks at whether or not the server sending you the email normally sends good emails or sends spam. With that one determination, they can properly pre-classify emails at a pretty high success rate. It's not a replacement for a spam filter at all. They know it's not that good. However, what it can do is do a pre-sort for prioritization purposes -- so that good emails tend to make it through the real spam filters faster. In a number of ways, it's pretty sad that we now need "quality of service" setups for our email.
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sounds familiar
just like the SPAMCOP service. IP addresses are flagged as "this host sent spam in the last 48 hours" by all the spamcop users who report their spam. The spamcop groups are constantly being berated by spammers and clueless users who don't understand why an email they sent was flagged as coming from a IP on the SPAMCOP list and they want spamcop to fix it.
If many ISPs use a spam block list for pre-filtering, life would be so much worse for spammers.
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