Murray S. Kucherawy wrote:
"greylisting is more expensive than not greylisting"
Can you explain this?
Put simply, any new filter has a cost to install, maintain, and
operate. For greylisting there has to be a local store of sources
that you've seen that get to bypass greylisting, so anything not on
that list gets caught. That takes space, I/O, and processing time.
So "expensive" in the resources sense.
On the other hand, if it stops a reasonable amount of spam, it reduces
bandwidth, processing time and storage requirements, as well as human
time & annoyance handling the spam.
It's up to the implementer to decide whether the cost of implementing
greylisting is more or less than the cost of not implementing it.
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