How to solve the problem of spam
...When an email program received a message that appeared to come from me at andfinally.com, it would first ask my mail server if there really was a message waiting to be collected.
It's a lot harder to hijack a site's domain entry than it is to forge a header, so most of the spam would never be accepted. And there would be no bounced messages since even the dumbest corporate email server would realise that a forged header which didn't relate to a message sitting on the real andfinally.com server didn't come from me.
Checking the originating domain is basically how SPF and Sender-ID work anyway but they are not yet in widespread use and take some effort to set up - as I am discovering. BBC NEWS | Technology | How to solve the problem of spam
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