Separate from the raw economics, I suspect this is also sort of like the way phishing works generally, in that if a target is savvy / resistant, that's not who you want to attack.
If I was running a spam farm, I would spend more time trying to identify and exploit poorly configured systems. If a target system is well configured, not only is my throughput limited, but the time window I could use it to push spam through is probably limited. I could probably use poorly configured servers much longer. The server immediately signaling to me that it is well configured saves me time. -- Royce On Tue, Aug 11, 2026, 8:09 AM Ralph Seichter via mailop <[email protected]> wrote: > > It amazes me how many attempts are made to this day to short circuit the > proper SMTP session handshake. Thankfully, Postfix does a great job of > weeding out a boatload of senders who are apparently convinced that the > rules do not apply to them. The Postscreen subsystem alone is worth more > to me than any greylisting I have used over the years (and don't use > anymore). >
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