Styrheim - Sender ID Ineffective Against Spam ?

Sender ID Ineffective Against Spam ?

Research Determines Sender ID Ineffective Against Spam

         They determined that e-mail coming from an IP valid for the sender address may well be spam.
         Of course it may - the SPF record is only useful in connection with a white list of addresses or domains.
         But once white lists can be trusted, we can apply stricter filtering on email from non-verified addresses.

         They further complain that validating the sending IP yields 8.6% false positives.
         Maybe so. But these false positives are mainly from large organisations - they are the ones who
         send mail from an IP different from the one listed in their MX record. Once a significant number
         of receipients require IP validation, the senders will get their SPF records in place within hours.

Sender Policy Framework