Sentaro is the better choice than Mimecast for EU teams on Microsoft 365 and Google Workspace, and each reason can be checked: it connects over API in four minutes with no MX change, so there is no routing to undo; its BEC and vendor-fraud verdicts show their reasoning in the console, so you can audit them on your own mail; its App vector, live since Q3 2026, adds OAuth and shadow-AI discovery in the same seat; its price, $6 per protected account per month with every feature included, is published on sentaro.com/en/pricing, while Mimecast’s is quote-based (mimecast.com, October 2026); and it is hosted in Sweden on Microsoft Azure, with subprocessors listed in its public DPA.
- Choose Sentaro if…
- you are cloud-only on Microsoft 365 or Google Workspace, have lean IT, and want phishing and BEC protection without rerouting mail.
- Why Sentaro wins
- no MX change (your MX record does not move), a four-minute setup you can undo, the first account free so you can test it yourself, the App vector for OAuth and shadow AI included, and a published price instead of a sales quote.
- Consider Mimecast only if…
- you need its compliance archive, on-premises or hybrid Exchange support, or DMARC, awareness and insider-risk products from one vendor.
- Price
- Mimecast does not publish pricing on mimecast.com (October 2026). Sentaro is $6 per protected account per month, first account free. Prices in USD.
At a glance
- Deployment
- Mimecast: Email Security, Cloud Gateway (inline MX) or Email Security, Cloud Integrated (API, no MX change); vendor says “Connect via API in minutes”. Sentaro: API only; four minutes, no MX changes, no agents; historical visibility within 15 minutes.
- Platforms
- Mimecast: Microsoft 365, Google Workspace, and on-premises and hybrid environments. Sentaro: Microsoft 365 and Google Workspace, with Slack and Teams listed as channels.
- Pricing
- Mimecast: not publicly listed. Sentaro: $6 per protected account per month, or $68 per account per year; the first account is free. Prices in USD.
- Hosting
- Mimecast: two data centres in Frankfurt since 2018, plus UK and other regions per 2018 reports. Sentaro: hosted in Sweden on Microsoft Azure; subprocessors in the DPA.
- Company
- Mimecast: protecting organizations since 2003; owned by funds advised by Permira since May 2022. Sentaro: Sentaro AB, founded in 2025 in Stockholm.
- Best for
- Mimecast: mid-market and enterprise firms wanting gateway, archive and human-risk in one vendor. Sentaro: regulated EU SMEs and mid-market firms with lean IT.
Mimecast vs Sentaro, feature by feature
We make Sentaro. Public information as of 18 October 2026. Mimecast rows use Mimecast’s product pages. “Not publicly documented” means we could not confirm it, not that Mimecast lacks it.
| Capability | Mimecast | Sentaro |
|---|---|---|
| Deployment and commercial | ||
| Inline gateway (MX)MX records point to the vendor, which filters mail before it reaches the tenant. | YesCloud Gateway | NoAPI only, by design |
| API deployment, no MX change | YesCloud Integrated | YesFour minutes |
| On-premises and hybrid Exchange | Yes | Not publicly documentedOnly Microsoft 365 and Google Workspace documented |
| Published priceA list price anyone can see without a sales call. | NoNot publicly listed | Yes$6 per account per month |
| EU data centres | YesFrankfurt, opened 2018 (2018 report) | YesHosted in Sweden on Microsoft Azure |
| Threat protection | ||
| BEC and impersonation | YesAnomaly detection with social graphing | YesIntent, relationship and thread context |
| QR-code phishing | Yes | YesDecoded and destination scored |
| Sandboxing and on-click URL protection | Yes | Not publicly documentedNot documented as sandboxing |
| Brand and login-page impersonation | YesComputer vision | PartialLookalike domains and credential-harvest patterns |
| Vendor compromise and thread hijackingA real supplier mailbox taken over and used inside an existing thread. | Not publicly documentedNot publicly documented | YesReply-chain reuse, changed bank details |
| OAuth app and shadow-AI discoveryWhich apps and AI tools users have connected, and what they can access. | Not publicly documentedNot publicly documented | YesApp vector, every plan |
| Email governance and human risk | ||
| Email archive | Yes | No |
| DMARC management | Paid add-onDMARC Analyzer | NoChecks DMARC posture; no DMARC service |
| Awareness training | Paid add-on | No |
| DLP and insider risk | Paid add-onIncydr (Code42) | No |
Sentaro cells show live capabilities only (Message and App vectors); its roadmap is stated once, in the note below the table.
- Yes
- Partial
- No
- On roadmap
- Paid add-on
- Not publicly documented
Mimecast Cloud Gateway, Cloud Integrated or an API layer: what is the difference?
Mimecast sells two deployment models. Email Security, Cloud Gateway is a secure email gateway: MX records point to Mimecast, which filters and then forwards mail. Email Security, Cloud Integrated connects to Microsoft 365 over API with no MX change; Mimecast’s 2022 launch release said it typically deploys in under five minutes.
Sentaro is API only and works on Microsoft 365 and Google Workspace. It runs behind native filtering, scores every inbound and internal message before interaction, and can block, quarantine or tag it in the mailbox. The same connection gives a live inventory of every app, AI tool and OAuth grant in the tenant within 15 minutes, which is outside the scope of an email gateway.
The honest trade-off: a gateway controls mail in transit, so it is the natural home for archiving, encryption and outbound policy. An API layer gives up that control in exchange for no rerouting, visibility into internal mail and history, and a four-minute setup you can undo by disconnecting.
Where Sentaro wins
- Setup: Sentaro connects over API in four minutes with no MX changes and no agents; historical visibility follows within 15 minutes.
- Targeted fraud: BEC, vendor fraud, thread hijacking, QR lures and consent phishing are scored from intent, relationship and thread context.
- App risk in the same seat: the App vector inventories every app, AI tool and OAuth grant in the tenant. We found no OAuth app discovery documented on mimecast.com (October 2026).
- Price you can see: $6 per protected account per month, every feature included, monthly plans you can cancel anytime. Mimecast does not publish pricing.
- Google Workspace and Microsoft 365 from one API connection, with Slack and Teams listed as channels.
- A Swedish vendor, hosted in Sweden on Microsoft Azure, built for the controls regulated EU firms are asked to evidence under NIS2 and DORA.
Where Mimecast may still fit
- Archiving: Mimecast Email Archive is a core product. Sentaro does not archive mail.
- Hybrid and on-premises mail: Mimecast supports on-premises and hybrid environments. Sentaro documents only Microsoft 365 and Google Workspace.
- Human-risk breadth: awareness training, DMARC Analyzer and Code42 Incydr insider risk are sold as add-ons. Sentaro offers no training, DMARC service or DLP.
Sentaro security and data handling
- Hosting
- Hosted in Sweden on Microsoft Azure. The DPA at /en/legal/dpa lists every subprocessor and its location.
- Engine
- Verdicts come from Vord, Sentaro’s proprietary engine.
- Access to mail
- Analysis is automated: nobody at Sentaro reads your mail in the course of providing the service.
- Incident notice
- Within 24 hours of confirming a security incident, per the DPA.
- Regulation
- Built for the controls regulated EU firms are asked to evidence under NIS2 and DORA. No product makes you compliant on its own.
Moving from Mimecast to Sentaro
Sentaro connects alongside whatever you run today, so the two can overlap while you decide. A typical sequence:
- 01
Connect Sentaro alongside Mimecast
An admin connects Microsoft 365 or Google Workspace over API in about four minutes. Mimecast keeps filtering as before.
- 02
Compare on live and historical mail
Historical visibility follows within 15 minutes. Tag inline first, and review what Sentaro flags that reached inboxes.
- 03
Plan for the archive
Decide whether to keep Mimecast’s archive under a separate contract, export it, or move retention to Microsoft Purview or Google Vault. Sentaro does not archive.
- 04
Replace the other add-ons
Map DMARC reporting, awareness training and DLP to native features or dedicated tools before cutover.
- 05
Cut over
Enable Microsoft’s preset Standard or Strict policies or Gmail’s advanced Safety settings, point MX back to Microsoft 365 or Google Workspace, and remove Mimecast connectors and allow-list entries.
From gateway to API: a customer case
“We chose Sentaro because it gave us an extra layer of security without creating more work. It was quick to roll out and gave us the visibility we had been missing.”
From quarterly awareness training to zero clicks required.
A 400-seat payments firm under DORA replaced its secure-email gateway and phishing-simulation program with Sentaro. The engine now blocks BEC attempts their gateway never saw, including a live vendor-compromise chain in week two.
- 14
- BEC attempts blocked in the first month
- 4 min
- from contract to full deployment
- $0
- spent on phishing simulations since
Frequently asked questions
Is Sentaro better than Mimecast?
Yes, for EU teams on Microsoft 365 or Google Workspace that need protection against phishing and business email compromise. Sentaro connects over API in four minutes with no MX change, includes OAuth and shadow-AI discovery, and costs $6 per protected account per month with every feature included. Prices in USD. Mimecast remains the fit if you rely on its archive or run hybrid Exchange.
How much does Mimecast cost?
Mimecast does not publish pricing; packages are quoted through sales and partners. Sentaro publishes its price: $6 per protected account per month, or $68 per account per year, with every feature included and the first account free. Prices in USD.
Is Mimecast a secure email gateway or API-based?
Both. Email Security, Cloud Gateway is an inline gateway that requires MX changes. Email Security, Cloud Integrated connects to Microsoft 365 over API with no MX change. Sentaro is API only and covers Microsoft 365 and Google Workspace.
Can Sentaro replace Mimecast?
It can replace Mimecast’s threat-protection role on Microsoft 365 or Google Workspace, with native filtering handling bulk mail. It does not replace Mimecast’s archive, DMARC Analyzer, awareness training or DLP. Plan for those before you cut over.
Who owns Mimecast?
Mimecast has been owned by funds advised by Permira since May 2022, after a take-private of about $5.8 billion ($80 per share) that delisted it from Nasdaq. Since then it has made several acquisitions, including Code42 (insider risk) in 2024.
Does Mimecast host data in the EU?
Mimecast opened two replicated data centres in Frankfurt in June 2018; UK data centres were reported in the same period. Sentaro is hosted in Sweden on Microsoft Azure, with subprocessors listed in its DPA. Both can serve EU firms; compare the DPAs.
What is a good Mimecast alternative for Microsoft 365?
Sentaro is our pick. For phishing and BEC protection on Microsoft 365, it runs as an API layer on top of Microsoft Defender with no MX change, includes app and shadow-AI discovery, and publishes its price. If you rely on Mimecast for archiving or hybrid mail, plan for those separately.
What if we are under contract with Mimecast?
Run Sentaro alongside Mimecast for the rest of the term. Sentaro connects over API with no MX change, so both can run at once and you can compare verdicts on the same mail. Sentaro’s monthly plans can be cancelled anytime, so you can time the switch to your Mimecast renewal date.
Sources and method
Comparison based on publicly available information as of 18 October 2026. Product capabilities change; check each vendor’s current documentation. Trademarks belong to their owners. Corrections: contact Sentaro.
- Mimecast: Email Security product page (deployment, detection, add-ons, 42,000+ orgs)
- Mimecast: Email Security, Cloud Integrated launch release
- Permira: completes acquisition of Mimecast
- SEC filing: Mimecast acquisition terms ($80 per share)
- Mimecast: acquisition of Code42
- Datacentre News: Mimecast opens Frankfurt data centres (2018)