Since SPF does not address this scenario (right?), couldn't spammers just
use non-existant domains?
Many mailservers reject this sort of mail already. I think it's even been
Sendmail's default for years.
...
In other words, SPF shouldn't need to get into this. Your server should
reject mail from nonexistent domains fbefore it even gets to an SPF
lookup.
OK. Thanks for all the responses. On the other hand,
Does anybody know how to do this with MS Exchange?
Thanks,
Marc
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