Our marketing team sends reports to our subscribers around 1500+ on a daily basis. We have configured Xeams for yahoo clients with a separate send connector from our Exchange server; As Xeams fulfills the configuration of DKIM that yahoo requires.

From 1500+ subscribers we have 150+ from yahoo users, and still, yahoo is detecting as unusual traffic from our IP. So I would be throttling only the yahoo users, and all other legit emails will be passing through our regular traffic.