Home / Partner Picks / Sentaro
Best for: Teams on Google Workspace or Microsoft 365
Last updated: September 04, 2026
Sentaro is an AI-native email security layer that sits on top of Google Workspace or Microsoft 365 and catches the targeted attacks native filters miss — phishing, business email compromise, spoofing and zero-day threats. Instead of blocklists and malware signatures, it reads sender behaviour, relationships, writing style and link destinations in real time, then labels every message Threat, Suspicious or Safe right inside Gmail and Outlook, with a plain-language reason for each flag. It connects via API in a few clicks with no MX or DNS changes and deploys in minutes, not weeks. Pricing is refreshingly simple for this category — a published ~$6 per protected account / month, with a custom tier for larger needs. The honest caveats: it is a newer product, evaluation is via demo plus a 14-day refund rather than a free trial, and it is a focused email layer, not a full enterprise suite. A strong, fast-to-deploy fit for SMBs — just pair it with payment-verification and training, not as a silver bullet.
STARTS AT
~$6 / mo
Unusually for this category, Sentaro publishes a flat rate: about $6 per protected account a month, slightly lower on annual billing, with monthly and yearly options. There's also a custom enterprise tier for advanced security and compliance needs. The vendor states there are no hidden fees, so cost scales simply with the number of mailboxes you protect — not by message volume or add-on modules.
No documented no-payment free trial. Instead there's a live demo that shows Sentaro detecting threats, and purchases through Paddle come with a 14-day refund window. So you evaluate via the demo and buy with a two-week money-back safety net rather than self-serving a trial first. If a true free trial is a procurement requirement, confirm current terms with Sentaro before committing.
No documented no-payment free trial. Instead there's a live demo that shows Sentaro detecting threats, and purchases through Paddle come with a 14-day refund window. So you evaluate via the demo and buy with a two-week money-back safety net rather than self-serving a trial first. If a true free trial is a procurement requirement, confirm current terms with Sentaro before committing.
No. Sentaro connects to Google Workspace or Microsoft 365 through an API in a few clicks — no MX or DNS changes and no mail-flow rerouting. That's a real difference from traditional secure email gateways, which need MX migrations and can take days or weeks. The company says deployment takes minutes. Still validate the connection permissions, admin setup and quarantine behaviour during onboarding.
Each incoming email is analysed in real time for phishing, BEC, spoofing, social engineering and zero-day threats. Rather than blocklists and signatures, it reads sender behaviour, relationships, writing style, link destinations and contextual anomalies. Messages are labelled Threat, Suspicious or Safe inside Gmail and Outlook, and it explains which parts of the email triggered the alert so recipients understand the flag.
Native filters catch obvious spam and known malware but are weakest against targeted phishing and BEC — usually malware-free social engineering with nothing for a signature filter to flag. Sentaro adds an AI behavioural layer on top of your existing provider rather than replacing it. Treat it as one control alongside payment-verification procedures, staff training and identity controls, not a guarantee every attack is stopped.
Best for small and mid-sized businesses on Google Workspace or Microsoft 365 that want stronger inbox protection without migrating providers — especially finance, legal and operations teams that are common BEC targets. Weaker fit for enterprises needing a mature suite with archiving, DLP, forensics and SOC workflows, for buyers requiring public SOC 2 docs upfront, and for anyone not on Google Workspace or Microsoft 365. It's a focused AI email layer, not an all-in-one platform.
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