On 11-10-18 03:42 PM, Daniel Feenberg wrote:
> Where should comments go? I have a question really, though it might be
> construed as a comment. Why do greylisters match on the (sender,
> receipient, MTA) triple rather on just the MTA? Isn't it nearly certain
> that if an MTA returns for one sender/receipient pair, it will return
> for any pair? So that keeping track of all three seems unnecessary and
> increases the probability of a message being delayed. What am I missing?
As I understand it, some grey-listing systems match on sender/recipient
pairs (not MTA) so as to not penalize clustered outbounds that share queues.
There's all sorts of 'optimizations'/variations that you can apply for
different behaviours.
You're right, _just_ the MTA would work just about as well for the main
use case: bot armies. But that's not the only potential use-case.
There is a danger in specifying the precise details/tuning values of a
"standardized gray listing" mechanism. If it's too predictable, you
could probably come up with a simplistic mechanism for defeating it
without requiring the complexity of queuing. "Hybrid vigor" is a good
thing.
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