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Maybe he's using some cloud provider smtp/api to send mail in which case it's not much of a headache, just a few lines of code.



The mail still has to come from a domain, which is one of the things that can show up on a blacklist.


If a spammer is able to exploit his system he'll either run out of money and/or his hostname will be blocked. His challenge is to filter spam before those few lines of code.




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