Email Security

Microsoft and Google's built-in filters are competent at catching obvious spam and known bad senders, but they're tuned for the average tenant and miss targeted attacks — spear phishing addressed to specific employees, business email compromise from spoofed executive accounts, malicious links that pass reputation checks at delivery and turn hostile later, and well-crafted phishing that uses legitimate sending services. Coro adds a dedicated AI layer on top: it analyzes the content, sender behavior, and link destinations, runs attachments through a sandbox, and re-checks every link at click time. Many of our clients run Coro alongside the native M365/Google filters, not as a replacement — defense in depth.

No. Coro connects to Microsoft 365 and Google Workspace through their APIs — no MX record changes, no mail flow rerouting, no downtime during setup. The deployment looks like authorizing a Coro service principal in your tenant; it then sees mail in your tenant in near-real-time, scans inbound and outbound messages, and quarantines threats. Because there's no rerouting, the cutover is reversible — you can disable the integration any time and email flow is unaffected. Most deployments are live within an hour.

BEC is one of the most expensive attack types — an attacker impersonates someone trusted (CEO, CFO, key vendor, business partner) and convinces an employee to wire funds, share credentials, change banking details, or buy gift cards. There's often no malicious attachment or link, just a well-crafted email asking for a routine business action. Coro detects BEC by analyzing the sender's relationship to the recipient (is this how the CEO normally writes? does the domain match prior legitimate correspondence?), looking for impersonation signals (spoofed display names, look-alike domains), and flagging high-risk requests (wire transfers, banking changes, gift card purchases) for review. Suspicious BEC attempts are quarantined or flagged before the employee acts.

Quarantined messages don't disappear. Users get a daily quarantine digest listing what was held and why, with a one-click option to release a message they were expecting. Admins (or Blue Cap IT, if we manage the platform for you) can review quarantine in bulk, release messages, and tune detection rules to prevent future false positives from the same sender or pattern. Senders that get incorrectly flagged repeatedly can be added to an allowlist. The false positive rate on Coro is low compared to legacy filters, but the workflow when it does happen is fast and self-service.

Yes — and many businesses run both (M365 in headquarters, Google Workspace at a subsidiary, or vice versa). Coro connects to each via the native API and protects them under the same dashboard and policies. Outbound DLP, phishing detection, attachment scanning, link rewriting, and quarantine all work identically across both platforms. We'll map your specific environment during a free assessment and configure the right integration pattern.