[LINK] Solution to SPAM checking

Adrian Chadd adrian at creative.net.au
Thu Feb 1 13:14:44 AEDT 2007


On Thu, Feb 01, 2007, Adam Todd wrote:

> Many of us who are mobile already use authentication between the random 
> remote user and the SMTP server to verify that the inbound mail to be 
> processed is in fact coming from an authenticated and approved source, and 
> then that user is in fact allowed to use the SMTP server for mail 
> transmission.

That may stop people from spamming with forged from: addresses, but it
won't stop spam:

* spammer registers domain(s);
* spammer sets up DNS for domains on botnet-owned hosts;
* spammer sets up authentication for domain on said hosts;
* spammser sends lot of mail



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