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A comment on Poste.io – Complete Mail Server. Parent comment

Re:Poste.io – Complete Mail Server by s17n on Wednesday February 22, 2023 @06:47PM (#34904814)
But to exploit this, an attacker would need to have the address book of every account they are trying to spam.
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Re:Poste.io – Complete Mail Server by shadowgovt on Wednesday February 22, 2023 @06:50PM (#34904850)
That's relatively trivial. Send N^2 emails, pay attention to the bounce backs.

There's almost no cost to send an email except time so even when n is large, this does not prove nearly as intractable as one wants it to be.

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