On Thu, May 8, 2014 at 5:03 PM, Murray S. Kucherawy <[email protected]>wrote:
> In terms of support costs, any filtering system is expensive when it's > wrong. The nature of email unfortunately means there are no absolutes. > > So again, assuming I have the model right, always doing the > whitelist/heuristics check reduces your support costs because it detects > faulty "fail" results and lets the mail through, reducing user complaints. > Isn't that worth the additional compute cycles or network round trips > required to do the check? > I should add that not all receivers will incur support costs when DMARC causes problems, and they're perfectly happy adhering to exactly what the Domain Owner asks the receiver to do, for better or worse. YMMV. -MSK
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