512 votes24 comments · Office 365 Security & Compliance » Spam & Phishing · Flag idea as inappropriate… · Admin →
ATP does not consider mails from other Office 365 tenants, or even mailboxes inside of your tenant, as safe. The best way to put a stop to this is to follow the recommendations in SecureScore for your tenant; and report phishing mails to us promptly.Tyler Bell commented
Microsoft has little to no threat intelligence for phishing attacks. This is only a rampant issue for 365. It does not happen on this scale with G Suite.