Phishing protection for Microsoft 365 and Google Workspace
Your native filters already stop bulk spam. Sentaro catches what gets through them: AI-written spear phishing, QR-code lures, OAuth consent phishing and zero-day attacks, judged by behavior instead of signatures.
- AI-native detection: intent, sender infrastructure and relationship history, not just payloads
- Decodes QR codes and evaluates their destinations like any URL
- Blocks consent phishing before OAuth access is granted
- Deploys via API in minutes. No MX changes, no agents
Last updated 2026-07-09
Why phishing still gets through
Native email filtering in Microsoft 365 and Google Workspace is genuinely good at what it was built for: bulk phishing, known-bad links and spam. What reaches inboxes anyway is the targeted remainder: messages written for one recipient, from infrastructure too new to be on any list, with the malicious part hidden in an image, an OAuth consent screen, or in pure text with no payload at all. Generative AI made that remainder cheap to produce at scale. The result: the phishing that matters most is precisely the phishing signature-based layers were never designed to catch.
How Sentaro decides
Every message is evaluated by the AI Threat Intelligence Agent across four layers: Message Intelligence reads content and intent, including credential-harvest patterns and urgency framing. Domain Intelligence examines the infrastructure: domain age, lookalike distance to brands you communicate with, sending history. Behavioral Intelligence compares against your organization's learned normal: who mails whom, when, about what. App Intelligence covers the OAuth side door. Verdicts come from models weighing all four together, which is why a clean-looking message from the wrong place still gets caught.
What it catches, by threat
AI-written spear phishing
Fluent, personalized, grammatically perfect: nothing for a content filter to flag. Sentaro judges everything the text cannot fake: the sender's infrastructure, the mismatch with the claimed relationship's history, and the intent behind the ask. See spear phishing.
Quishing (QR-code phishing)
The link hides in pixels and the session moves to a phone. Sentaro decodes QR codes during scanning and evaluates their destinations like any URL, catching the MFA-renewal and voicemail lures that text-only scanners pass. See quishing.
Consent phishing (OAuth attacks)
The victim never enters a password; they click Allow on a malicious app. Sentaro blocks the lures in mail flow and flags the risky grant itself, closing the attack that survives password resets and MFA. See consent phishing.
Zero-day and novel payloads
No signature exists for a zero-day by definition. Sentaro needs none: anomalous senders, unexpected attachment behavior and out-of-pattern delivery flag the carrier email before the exploit is ever opened.
The smishing pivot
When a thread tries to escape to SMS ("text me on my cell"), paired with payment or credential intent, Sentaro flags the channel switch, the last observable moment before the attack leaves monitored ground. See smishing.
Sentaro alongside your native filters
| Native filtering (EOP/Gmail) | Secure email gateway | Sentaro | |
|---|---|---|---|
| Bulk phishing and spam | Strong | Strong | Complements, not replaces |
| AI-written targeted phishing | Limited | Limited (signature-based) | Core strength |
| QR-code decoding and analysis | Partial | Rarely | Yes |
| OAuth consent phishing | Limited | No | Yes, mail flow + grant visibility |
| Payload-free BEC | Limited | No | Yes (see BEC protection) |
| Learns your organization's normal | No | No | Yes |
| Deployment | Built-in | MX rerouting | API, minutes |
Built for lean teams
Verdicts are automatic, remediation is a click, and alerts fire when a decision is needed, not for every blocked message. One API connection to Google Workspace or Microsoft 365 covers phishing protection, BEC protection and shadow IT discovery in the same platform.
FAQ
- Do we need this if we have Microsoft Defender or Google’s built-in protection?
- Native filters are a good baseline for bulk attacks. Sentaro adds the behavioral layer for what they miss by design: targeted, novel and payload-free attacks. The two run together; Sentaro deploys alongside without MX changes.
- How is this different from a secure email gateway?
- Gateways reroute your mail through signature-based scanning outside your environment. Sentaro connects via API inside Google Workspace or Microsoft 365, sees internal and historical mail as well, and judges behaviorally, which is what catches never-seen-before attacks.
- Does it catch phishing without links or attachments?
- Yes. Intent and behavioral signals do not require a payload. That class of attack, including business email compromise, is a core design target, not an edge case.
- What happens when something is caught?
- Malicious messages are removed or quarantined automatically, similar messages across all mailboxes can be remediated in one action, and each verdict shows its reasoning so admins can audit decisions.
- How long does deployment take?
- Minutes: an admin connects Sentaro to Google Workspace or Microsoft 365 via API. Protection and historical visibility begin the same day, with no mail rerouting or end-user setup.
- Does it work for internal email?
- Yes. Because Sentaro sits inside the environment via API, it also evaluates internal mail, which is where attacks spread after an account is compromised.
Stop the phishing your filters were never built for
Connect Sentaro to Google Workspace or Microsoft 365 and protection begins the same day.