der Mouse <mouse(_at_)Rodents(_dot_)Montreal(_dot_)QC(_dot_)CA> wrote:
I'm just idly curious (like you I have zero confidence in
proof-of-work schemes) but why wouldn't they all be equivalent to
"don't send me your next command for (at least) N seconds or I'll
drop the connection"?
No, because "wait for N seconds" is parallelizable across many
connections, whereas "do N cpu-seconds of work" isn't.
Many MTA's can limit the number of simultaneous connections from
clients, and can group the connections into pools. Until the spam
attempts went up by another order of magnitude, I was quite successful
in limiting my MTA to ~50 connections, with ~10 reserved for the pool
of MX's that most of my traffic came from.
In the end, it was easier to discard the domain, and move to another
one. But that solution doesn't scale, which is why we're here.
Alan DeKok.
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