On Tue, 3 Feb 2004, Marc Alaia wrote:
Since SPF does not address this scenario (right?), couldn't spammers just
use non-existant domains?
A lot of MTAs now have the option to check that the message's return path
is actually routable before accepting it. Exim does this, for example.
We run it at work, and it rejects several messages a day due to them
claiming to be from non-routable domains.
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