Assuming about one of a thousand mail addresses in a spammer's address
list is a spam trap, a spammer may be able to send one or two thousand
spams (but certainly not billions!) using his newly acquired domain before
the domain gets blacklisted.
That is a very, very important point that I hadn't seen come up
before. That helps a *lot* with the "But spammers will just publish their
own SPF records" argument.
-Scott
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