Forgive my stupidness..

We've got 11 gates deployed, each one of them set in proxy mode

We also manage 50+ O365 deployments. Seeing a lot of https redirects to known phishing websites in the last three weeks.

URL in mail: https://www.marderseidlerlaw.com/9876

Phishing link: https://www.midwestexp.net/wep/21/login.php?wa=wsignin1.0&rpsnv=13&ct=1506170093&rver=6.7.6643.0&wp=MBI_SSL_SHARED&wreply=inbox&lc=1033&id=64855&mkt=en-us&cbcxt=mai

I reported both links as phishing. Second URL now blocked.

How can I stop the gates from allowing an https redirect to Phishing URL with having to install certificates on 300+ machines at 10 sites?

Arrgh! Any help GREATLY appreciated.