Spam filters by DNS sender verification
Posted Mar 4, 2006 8:31 UTC (Sat) by Ausdarren
Parent article: The Grumpy Editor's guide to bayesian spam filters
I think the filter debate has missed one crucial fact. Most Spam is trying to pretend it is someone it is not. Almost all genuine mail actually comes from the server that it appears to.
If sendmail on the receiving system, verified using DNS, that the ip address of the mail server trying to connect to deposit a mail item on the receiving mail server, was really coming from where it said it was coming from, and then reject all mail that appear false, most of the problem would be resolved. I'm not a programmer, and I expect that legitimate operators would need to ensure that the domain they use to send from was correctly registered in DNS; however the benefits to the entire internet community would be substantial, and well worth the teething trouble to implement.
Can this be done? Is it Feasiable?
to post comments)