Best tools · Small businessVictor TräffWritten by Victor Träff · Security expert and co-founder, Sentaro Reviewed

9 best email security tools for small business (2026)

The best email security for a small business on Microsoft 365 or Google Workspace in 2026 is Sentaro, because it costs a published $6 per protected account per month with the first account free, connects over API in about four minutes without an MX change, and needs no security staff to run. The other strong options are Microsoft Defender for Office 365 Plan 1 (already inside Microsoft 365 Business Premium), Google Workspace’s built-in protection, and Barracuda Email Protection for teams that want backup and archiving in the same bundle.

  • 9 tools compared
  • Last verified 21 October 2026
  • Published method and weights
  • Sentaro publishes this list
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Our recommendation

Sentaro is the best email security for small businesses on Microsoft 365 and Google Workspace. A small team needs three things from email security: a price it can see before talking to anyone, a setup the office manager or a part-time IT contractor can finish in one sitting, and protection against the fake invoice or the “quick favour” email from the boss, which carry no malware for a filter to find. Sentaro publishes this list and ranks itself first; scores use the method below and public vendor documentation as of 21 October 2026.

Why Sentaro wins
The price is published: $6 per protected account per month, or $68 per account per year, and the first account is free, with every feature included (prices in USD, see /en/pricing). It connects over the Microsoft 365 and Google Workspace APIs in four minutes with no MX change and no agents (see /en/platform). Detection targets payload-free fraud such as supplier bank-detail changes and CEO impersonation.
Choose Sentaro if
You are a 5 to 300 person team without a security person, you pay suppliers by bank transfer, and you want protection running today rather than after a sales cycle.
Keep Defender or Google switched on
If you have Microsoft 365 Business Premium, Defender for Office 365 Plan 1 is already paid for and is a good baseline. Sentaro is designed to run alongside it, not replace it.
Consider Barracuda or Hornetsecurity only if
You want one bundle that also covers backup, archiving and encryption, and you are fine with quote-based pricing through a reseller.

Quick picks

  • Best overall for small businessSentaro Our pickPublished $6 per account price, first account free, four-minute API setup on Microsoft 365 and Google Workspace.
  • Best native option for Microsoft 365Microsoft Defender for Office 365Plan 1 is included in Microsoft 365 Business Premium and costs $2 per user per month on its own.
  • Best baseline for Google WorkspaceGoogle Workspace built-in protectionIncluded in every Workspace plan; advanced phishing and malware settings are in the Admin console.
  • Best all-in-one bundleBarracuda Email ProtectionPlans add encryption, DLP, DMARC reporting, Microsoft 365 backup and archiving under one contract.
  • Best with phishing simulation bundledIRONSCALESMailbox-level API protection with awareness training and simulation in its higher tiers.

At a glance

What we compared
Email security a small business can add to Microsoft 365 or Google Workspace: native protection, API-based (ICES) tools and SMB gateway suites
Tools ranked
9
Audience
Small businesses, roughly 5 to 300 people, on Microsoft 365 or Google Workspace, with no dedicated security staff
Method
Six weighted criteria (below), scored 0 to 10 from public vendor documentation; overall score is the weighted average
Last verified
21 October 2026
Who wrote it
Sentaro, which makes one of the ranked tools. Sentaro publishes this list and ranks itself first.

Small business email security compared

Sentaro first, then by overall score. “Quote” means the vendor does not publish a price.

CapabilityDeploymentPlatformsPriceSetup claimScore
Sentaro (our pick)[1]API, no MX changeMicrosoft 365, Google Workspace$6 per account/month; first account freeFour minutes8.4
Microsoft Defender for Office 365[4]Native to Exchange OnlineMicrosoft 365 onlyPlan 1 $2/user/month; included in Business PremiumAlready in the mail flow7.4
Google Workspace built-in protection[6]Native to GmailGoogle Workspace onlyIncluded in Workspace plansSettings in the Admin console7.1
Barracuda Email Protection[10]API, no MX changeMicrosoft 365, Google WorkspaceQuote“Operational in minutes”6.6
IRONSCALES[13]API at mailbox levelMicrosoft 365, Google WorkspaceQuote (tiers published)“Deploys in minutes”6.4
Check Point Harmony Email[8]API with inline optionMicrosoft 365, Google WorkspaceQuote“Deploy in minutes”6.3
Proofpoint Essentials[14]Gateway (MX)Microsoft 365 (and other MX hosts)Reseller list from $3.93/user/monthOnboarding under five minutes (vendor)5.8
TitanHQ SpamTitan / PhishTitan[17]Gateway (SpamTitan) or Graph API (PhishTitan)Microsoft 365; Google Workspace per FAQQuote“Up and running in 10 minutes” (PhishTitan)5.6
Hornetsecurity 365 Total Protection[16]MX, API or hybridMicrosoft 365Quote, via partnersNot stated5.2

Vendor facts from each vendor’s public pages, checked 21 October 2026. Setup claims are the vendors’ own words.

  • Yes
  • Partial
  • No
  • On roadmap
  • Paid add-on
  • Not publicly documented
Try it on your own tenant. API connection in about four minutes, alongside what you run today. $6 per account / month.Start freeSpeak to sales →

How we evaluated small business email security

A small business buys email security differently from an enterprise: there is no security team to run a tool, no budget line for a sales cycle, and fraud by email costs more than malware. The weights reflect that buyer.

CriterionWeightWhy it matters
Published price and total cost25%Small teams compare prices before they talk to anyone. A published per-user price, no minimums and everything included scores highest; quote-only scores lowest.
Setup without an IT team20%Time to protection and risk to mail flow. Native tools and API connections that leave the MX record alone score highest; gateway projects score lower.
Self-serve buying15%Can an owner sign up, start and cancel without a sales call or a reseller?
Payload-free fraud detection15%Invoice fraud, CEO impersonation and supplier bank-detail changes carry no link or attachment, and they are the attacks that cost small firms money.
Microsoft 365 and Google Workspace coverage10%Many small firms run one of each, or switch. Tools that cover both score highest.
Bundled extras15%Backup, archiving, encryption, DLP and awareness training from the same vendor. This is where suites beat focused tools, including Sentaro.

Editorial scores using the criteria and weights above; based on public documentation, not lab tests. “Not publicly documented” scores in the low-middle range, never as a capability.

The 9 best email security tools for small business

Each entry answers the questions a small-business owner asks first: what it costs, who sets it up, and what it leaves out.

  1. Sentaro

    Our pickOverall score: 8.4out of 10

    Best for: Small teams on Microsoft 365 or Google Workspace that want fraud protection running today at a published price.

    Sentaro is an API-based email and SaaS security platform for Microsoft 365 and Google Workspace, built in Stockholm and hosted in Sweden on Microsoft Azure. An admin connects the tenant over API in four minutes, with no MX change and no agents; protection starts immediately and historical visibility follows within 15 minutes. Verdicts are automatic and alerts fire only when a decision is needed, which is what a business without a security person needs. Pricing is published at /en/pricing.[1]

    Published price and total cost
    9.0
    Setup without an IT team
    10.0
    Self-serve buying
    9.0
    Payload-free fraud detection
    9.0
    Microsoft 365 and Google Workspace coverage
    10.0
    Bundled extras
    3.0

    Pros

    • Published price: $6 per protected account per month or $68 per year; the first account is free. Prices in USD.
    • Connects in four minutes over API; your MX record does not change.
    • Built for payload-free fraud: supplier bank-detail changes, CEO impersonation, thread hijacking and QR-code lures.
    • Shows every app, AI tool and OAuth grant in the tenant, in the same price.
    • Hosted in Sweden on Microsoft Azure; subprocessors listed in the DPA at /en/legal/dpa.

    Cons

    • No backup, archiving, encryption or awareness training: pair it with what you already have.
    • Supports cloud mailboxes on Microsoft 365 and Google Workspace; on-premises Exchange is not listed as supported.
    • SOC 2 and ISO 27001 certification in progress, not yet signed.
    • Identity and Behavioral vectors (account-takeover signals, leaked credentials) reach general availability in Q4 2026.
    Pricing
    $6 per protected account per month, or $68 per account per year; the first account is free. Every feature included. Prices in USD.
    Deployment
    API via the Microsoft 365 and Google Workspace admin SDKs; no MX change, no agents
    Platforms
    Microsoft 365, Google Workspace; email, Slack and Teams
    Hosting
    Hosted in Sweden on Microsoft Azure; subprocessors in the DPA
    More on Sentaro

  2. Microsoft Defender for Office 365

    Best native for Microsoft 365Overall score: 7.4out of 10

    Best for: Microsoft 365 tenants on Business Premium, where Plan 1 is already paid for.

    Defender for Office 365 is Microsoft’s own email protection, native to Exchange Online. Microsoft documents Plan 1 as adding user and domain impersonation protection, mailbox intelligence, Safe Links and Safe Attachments on top of the built-in protection every cloud mailbox gets. Plan 1 is included in Microsoft 365 Business Premium ($22 per user per month, up to 300 users) and costs $2 per user per month on its own. For most small Microsoft 365 businesses it is the right baseline to switch on first.[3]

    Published price and total cost
    9.0
    Setup without an IT team
    9.0
    Self-serve buying
    8.0
    Payload-free fraud detection
    6.0
    Microsoft 365 and Google Workspace coverage
    5.0
    Bundled extras
    5.0

    Pros

    • Already included in Microsoft 365 Business Premium; $2 per user per month standalone.
    • Native in the mail flow, so there is nothing to route or connect.
    • Safe Links checks URLs, which Microsoft says includes QR-code-based attacks (June 2026 blog).
    • EU Data Boundary for tenants signed up in the EU or EFTA.

    Cons

    • Microsoft 365 only.
    • Attack simulation training and automated investigation need Plan 2 ($5) or E5.
    • OAuth app governance is a separate product (Defender for Cloud Apps).
    Pricing
    Plan 1 $2, Plan 2 $5 per user per month (annual); Plan 1 included in Business Premium
    Deployment
    Native to Exchange Online, in the mail flow
    Platforms
    Microsoft 365 only
    Hosting
    EU Data Boundary for EU/EFTA tenants (Multi-Geo excluded)
    Sentaro vs Microsoft Defender for Office 365 Vendor site

  3. Google Workspace built-in protection

    Best Workspace baselineOverall score: 7.1out of 10

    Best for: Google Workspace businesses that want to switch on what they already pay for.

    Gmail’s built-in filtering comes with every Workspace plan. Google documents advanced phishing and malware protection settings in the Admin console: protection against similar-domain and employee-name spoofing, warnings on links to untrusted domains, and checks on encrypted or scripted attachments. The Gmail Security Sandbox, which detonates attachments, is in Business Standard and above but not Business Starter. Turning these settings on is the first step for any Workspace business.[6]

    Published price and total cost
    9.0
    Setup without an IT team
    8.0
    Self-serve buying
    9.0
    Payload-free fraud detection
    5.0
    Microsoft 365 and Google Workspace coverage
    5.0
    Bundled extras
    4.0

    Pros

    • Included in every Workspace plan.
    • Similar-domain and employee-name spoofing protection in the Admin console.
    • Security Sandbox on Business Standard and above.
    • Europe data region on Business Standard and above.

    Cons

    • Google Workspace only.
    • Advanced settings are off until an admin switches them on.
    • Google documents spoofing and name checks for BEC; no behavioral model for supplier or CEO fraud is documented.
    Pricing
    Included in Workspace plans (Business Starter to Plus: EUR 6.80 to 21.10 per user/month)
    Deployment
    Native to Gmail
    Platforms
    Google Workspace only
    Hosting
    Europe data region on Business Standard and above
    Sentaro vs Google Workspace security Vendor site

  4. Barracuda Email Protection

    Best bundleOverall score: 6.6out of 10

    Best for: Small businesses that want email security, backup and archiving from one vendor.

    Barracuda Email Protection connects over API without MX changes and, by the vendor’s description, is “operational in minutes, not weeks”. Its three plans (Advanced, Premium, Premium Plus) stack phishing and BEC protection, account-takeover detection, DMARC reporting, encryption and DLP, then Microsoft 365 backup and cloud archiving with awareness training at the top. No plan price is published on barracuda.com. If one contract for everything matters more than price transparency, it is the most complete bundle here.[11]

    Published price and total cost
    3.0
    Setup without an IT team
    8.0
    Self-serve buying
    5.0
    Payload-free fraud detection
    7.0
    Microsoft 365 and Google Workspace coverage
    9.0
    Bundled extras
    10.0

    Pros

    • The broadest single bundle on this list: encryption, DLP, DMARC reporting, backup, archiving and training.
    • API deployment with no MX change, on both Microsoft 365 and Google Workspace.
    • Free Email Threat Scan to see what is already in your mailboxes.

    Cons

    • No published prices; plans are quote-based.
    • The full bundle needs the top plan (Premium Plus).
    • API modules (Impersonation Protection, Incident Response) are listed in US regions only.
    Pricing
    Quote-based; three cumulative plans
    Deployment
    API-first, no MX change
    Platforms
    Microsoft 365, Google Workspace
    Hosting
    Trust center: Email Gateway Defense in Frankfurt and London regions; Impersonation Protection and Incident Response in US regions
    Sentaro vs Barracuda Vendor site

  5. IRONSCALES

    Best with training bundledOverall score: 6.4out of 10

    Best for: Small businesses that want phishing simulation and awareness training in the same product.

    IRONSCALES protects mailboxes over API alongside any existing filter and says it “deploys in minutes, no MX changes”. It builds behavioral baselines per mailbox and adds crowdsourced intelligence from its customer community; the vendor reports 18,000+ organizations and 3,000+ MSPs. Its pricing page lists tiers from Email Essentials to Complete Protect, with awareness training and simulation in the higher tiers, but every tier is “Request a Quote”.[12]

    Published price and total cost
    4.0
    Setup without an IT team
    8.0
    Self-serve buying
    4.0
    Payload-free fraud detection
    8.0
    Microsoft 365 and Google Workspace coverage
    9.0
    Bundled extras
    7.0

    Pros

    • Phishing simulation and awareness training available in the same platform.
    • API deployment alongside any existing filter, no MX change.
    • Community intelligence from other customers’ reports.

    Cons

    • No published prices.
    • Training, encryption and DLP sit in higher tiers.
    • Subprocessor list names AWS in both the USA and Germany without saying who is hosted where.
    Pricing
    Quote-based; tiers published, monthly or annual billing
    Deployment
    API at mailbox level; works alongside a gateway
    Platforms
    Microsoft 365, Google Workspace
    Hosting
    Subprocessor list names AWS in the USA and AWS Europe (Germany)
    Sentaro vs IRONSCALES Vendor site

  6. Check Point Harmony Email

    Overall score: 6.3out of 10

    Best for: Small businesses that also want Slack, Teams and file-sharing apps scanned by the same tool.

    Check Point Harmony Email & Collaboration (formerly Avanan) connects over API and can be set from monitor mode to inline prevention, which inspects messages before they reach the inbox. It also scans Teams, Slack, OneDrive, SharePoint, Google Drive, Box and Dropbox. Check Point publishes four tiers but no prices. It is a strong product built for companies of every size; for a small business the main friction is buying it.[9]

    Published price and total cost
    3.0
    Setup without an IT team
    9.0
    Self-serve buying
    4.0
    Payload-free fraud detection
    7.0
    Microsoft 365 and Google Workspace coverage
    10.0
    Bundled extras
    7.0

    Pros

    • Inline prevention via API, so messages can be stopped before the inbox.
    • Covers collaboration and file-sharing apps beyond email.
    • Data residency regions include Ireland.

    Cons

    • No published prices.
    • Archiving, DMARC management and training are add-ons.
    • QR-code phishing is not named on the pages we checked.
    Pricing
    Quote-based; four published tiers
    Deployment
    API with configurable inline prevention; no MX change
    Platforms
    Microsoft 365, Google Workspace, plus collaboration apps
    Hosting
    Data residency regions include Ireland (EMEA)
    Sentaro vs Check Point Harmony Email Vendor site

  7. Proofpoint Essentials

    Overall score: 5.8out of 10

    Best for: Small businesses whose MSP already resells Proofpoint and who want a gateway filter.

    Proofpoint Essentials is Proofpoint’s SMB line, sold through MSPs and resellers and deployed as an MX gateway. Proofpoint does not publish a price list; one US reseller lists Business at $3.93, Advanced at $5.37 and Professional at $8.14 per user per month for 1 to 25 users, with Plus variants that add AI-based BEC detection and warning tags. Higher tiers add encryption and 10-year archiving.[14]

    Published price and total cost
    6.0
    Setup without an IT team
    5.0
    Self-serve buying
    4.0
    Payload-free fraud detection
    6.0
    Microsoft 365 and Google Workspace coverage
    6.0
    Bundled extras
    8.0

    Pros

    • Proofpoint’s filtering at a small-business price point.
    • DLP in every tier; encryption and archiving in higher tiers.
    • Widely available through MSPs.

    Cons

    • MX gateway: your mail routing changes.
    • No price list from Proofpoint itself.
    • AI BEC detection sits in the Plus variants.
    Pricing
    Reseller list: Business $3.93, Advanced $5.37, Professional $8.14 per user/month (1–25 users)
    Deployment
    Gateway (MX)
    Platforms
    Microsoft 365; other mail hosts via MX
    Hosting
    Subprocessor list names AWS Frankfurt and data centres in Germany and the Netherlands
    Sentaro vs Proofpoint Vendor site

  8. TitanHQ SpamTitan / PhishTitan

    Overall score: 5.6out of 10

    Best for: Small businesses that want modular spam filtering, archiving and DNS filtering from one SMB vendor.

    TitanHQ, now part of Bregal Milestone’s CyberSentriq group, sells SpamTitan (a cloud or on-premises spam filter) and PhishTitan, which runs inline in Microsoft 365 over the Graph API and claims “protection up and running in 10 minutes”. PhishTitan names BEC, CEO and invoice fraud. Encryption, archiving, DNS filtering and training are separate modules or bundles. The pricing page shows bundles but no figures.[17]

    Published price and total cost
    3.0
    Setup without an IT team
    7.0
    Self-serve buying
    4.0
    Payload-free fraud detection
    6.0
    Microsoft 365 and Google Workspace coverage
    7.0
    Bundled extras
    8.0

    Pros

    • PhishTitan connects over the Graph API with a 10-minute setup claim.
    • Many modules: archiving, encryption, DNS filtering, training, backup.
    • Sold in USD, EUR, GBP and other currencies.

    Cons

    • No published prices.
    • Google Workspace support appears only in a FAQ.
    • Each capability is a separate module or bundle.
    Pricing
    Quote-based; per user per product, bundles available
    Deployment
    SpamTitan gateway (MX); PhishTitan inline in Microsoft 365 via Graph API
    Platforms
    Microsoft 365; Google Workspace per FAQ
    Hosting
    Not publicly documented
    Vendor site

  9. Hornetsecurity 365 Total Protection

    Overall score: 5.2out of 10

    Best for: Microsoft 365 small businesses that want filtering, archiving, backup and training in one tiered licence via a partner.

    Hornetsecurity, owned by Proofpoint since December 2025, sells 365 Total Protection in four plans: Business (filtering, encryption, signatures), Enterprise (adds AI-based threat protection, continuity and archiving), Enterprise Backup (adds Microsoft 365 backup) and Compliance & Awareness (adds training and DMARC management). It runs in MX, API or hybrid mode and the vendor states it uses 12 regional data centers independent of Microsoft’s infrastructure. Prices are not published.[16]

    Published price and total cost
    3.0
    Setup without an IT team
    6.0
    Self-serve buying
    5.0
    Payload-free fraud detection
    4.0
    Microsoft 365 and Google Workspace coverage
    5.0
    Bundled extras
    9.0

    Pros

    • Four clear tiers from filtering up to backup and compliance.
    • Encryption from the first plan; archiving and backup in higher plans.
    • European data centres, per the vendor.

    Cons

    • Microsoft 365 only.
    • No published prices; bought through partners.
    • BEC-specific detection is not documented on the product page.
    Pricing
    Quote-based; tiered plans via partners
    Deployment
    MX, API or hybrid modes
    Platforms
    Microsoft 365
    Hosting
    Vendor: “12 regional data centers, independent of Microsoft’s infrastructure”
    Sentaro vs Hornetsecurity Vendor site

How to choose email security for a small business

Start with what you already pay for. If you are on Microsoft 365 Business Premium, Defender for Office 365 Plan 1 is included: check that its preset Standard or Strict policy is applied. If you are on Google Workspace, open Admin console > Gmail > Safety and switch on the advanced phishing and malware settings. That costs nothing and closes the gap for bulk phishing and known malware.

Then ask what the native layer is not built for. Microsoft and Google filter at scale and are good at known-bad links and files. The emails that cost small businesses money usually have neither: a supplier “updating” bank details in a real thread, an email that looks like it is from the owner asking for a quick transfer, or a QR code that leads to a fake Microsoft login. The FBI’s Internet Crime Complaint Center counted $3.05 billion in reported business email compromise losses in 2025, about $123,000 per complaint (FBI IC3, 2025).

Five questions to ask any vendor

  • What does it cost for our exact number of mailboxes, and is that price written down anywhere public? Are there minimums or annual commitments?
  • Does it change our MX record or mail routing? If it does, what happens to mail if the service is down?
  • Who looks at the alerts? If the answer is “your IT person”, how many alerts a week should we expect?
  • How does it detect an invoice-fraud email that has no link and no attachment?
  • Where is our mail processed and stored, and where is the subprocessor list?

Focused tool or all-in-one bundle?

Bundles such as Barracuda, Hornetsecurity 365 Total Protection and TitanHQ put backup, archiving and training under one contract, usually quote-based through a reseller. Focused tools such as Sentaro do one job, detection, and leave backup and archiving to what you already have; Microsoft 365 and Google Workspace both include retention options. If you have no backup at all, solve that first. If you have backup and want fraud protection running this week, a focused tool is faster and cheaper to start.

What the first month looks like with Sentaro

You sign up at app.sentaro.com/signup; the first protected account is free. An admin connects Microsoft 365 or Google Workspace over API, which takes about four minutes, and Sentaro scans existing mail and app grants so historical visibility is available within 15 minutes. From then on, verdicts are labeled in the mailbox, malicious messages are removed or quarantined automatically, and you get an alert only when a decision is needed. Each extra account is $6 per month, or $68 per year, prices in USD. The step-by-step guide is on /en/solutions/email-security-for-small-business.

Certification and compliance status

Sentaro’s own status, stated exactly. Competitor certifications are on their entries where documented.

SOC 2
In progressCertification in progress. Evidence pack on request. No target date is published.
ISO 27001
In progressCertification in progress. Evidence pack on request.
Google CASA
Verified API integration
DPA and subprocessors
PublishedData Processing Agreement and subprocessor list.

Frequently asked questions

What is the best email security for a small business?

Sentaro is the best email security for small businesses on Microsoft 365 and Google Workspace. It costs a published $6 per protected account per month with the first account free, connects over API in about four minutes without changing your MX record, and runs automatically, alerting only when a decision is needed. Keep Defender for Office 365 or Google’s built-in protection switched on underneath it.

Is Microsoft Defender in Business Premium enough for a small business?

It is a good baseline. Business Premium includes Defender for Office 365 Plan 1, which Microsoft documents as adding impersonation protection, Safe Links and Safe Attachments. Microsoft describes that protection as policy-based; it covers Microsoft 365 only, and OAuth app governance is a separate product (Defender for Cloud Apps). Many small businesses keep it on and add an API-based layer for supplier fraud and CEO impersonation.

How much should a small business pay for email security?

Published prices in this list range from $2 per user per month for Defender for Office 365 Plan 1 to $6 per account per month for Sentaro, with Proofpoint Essentials listed by one reseller at $3.93 to $8.14. Most other vendors quote on request. Compare total cost: the license, the time to set it up, and the time spent on alerts.

Do I need to change my MX record to add email security?

Not with API-based tools. Sentaro, Barracuda, IRONSCALES and Check Point connect to Microsoft 365 or Google Workspace over API and leave mail routing alone. Gateway products such as Proofpoint Essentials and SpamTitan sit in front of your mailbox and need an MX change, which also means mail depends on the gateway being available.

Can a small business without IT staff run email security?

Yes, if the tool acts on its own. Look for automatic removal of malicious messages, verdicts shown in the mailbox, and alerts only when someone has to decide. Sentaro works this way: verdicts are automatic, remediation is a click, and the setup is a four-minute API connection an owner or contractor can do.

Does Google Workspace need extra email security?

Gmail’s built-in filtering is strong against bulk spam and malware, and Google documents spoofing and link protections in the Admin console. Google documents its BEC-related settings as spoofing and name checks rather than a behavioral model, and the attachment sandbox is not in Business Starter. Workspace businesses that pay suppliers by email often add an API-based layer for payload-free fraud.

Is it safe to put a small vendor like Sentaro on our mailboxes?

Check it as you would any processor. Sentaro is hosted in Sweden on Microsoft Azure, publishes its DPA and subprocessor list at /en/legal/dpa, and states that nobody at Sentaro reads your mail in the course of providing the service. SOC 2 and ISO 27001 certification are in progress, with an evidence pack on request.

Sources and method

Sentaro publishes this list and ranks itself first; scores use the method above and public vendor documentation as of 21 October 2026. Product capabilities and prices change; check each vendor’s current documentation. Trademarks belong to their owners. Corrections: contact Sentaro.

  1. Sentaro pricing
  2. Sentaro Data Processing Agreement and subprocessor list
  3. Microsoft Learn: Why do I need Microsoft Defender for Office 365? (accessed 2026-10-18)
  4. Microsoft: Defender for Office 365 pricing (accessed 2026-10-18)
  5. Microsoft licensing news: 2026 Microsoft 365 packaging and pricing updates
  6. Google Workspace Admin Help: Advanced phishing and malware protection
  7. Google Workspace pricing (accessed 2026-10-18)
  8. Check Point: Harmony Email & Collaboration (accessed 2026-10-18)
  9. Check Point: Harmony Email & Collaboration pricing tiers (accessed 2026-10-18)
  10. Barracuda: Email Protection (accessed 2026-10-18)
  11. Barracuda: Email Protection plans (accessed 2026-10-18)
  12. IRONSCALES: Home page (accessed 2026-10-18)
  13. IRONSCALES: Pricing (accessed 2026-10-18)
  14. Iron Cove Solutions (reseller): Proofpoint Essentials pricing 2026 (accessed 2026-10-21)
  15. Proofpoint: Proofpoint completes acquisition of Hornetsecurity (December 2025)
  16. Hornetsecurity: 365 Total Protection plans (accessed 2026-10-21)
  17. TitanHQ: PhishTitan phishing protection (accessed 2026-10-21)
  18. TitanHQ: Pricing (accessed 2026-10-21)
  19. Bregal Milestone: CyberSentriq formed from Redstor and TitanHQ (June 2025)
  20. Microsoft Tech Community: Defender for Office 365 Plan 1 rolling out to Microsoft 365 E3 (2026-06-17)
  21. Sentaro platform: deployment and engine
  22. FBI IC3 Internet Crime Report 2025
  23. Barracuda Trust Center: Data center locations (accessed 2026-10-21)
  24. IRONSCALES: List of current sub-processors (PDF, December 2024; accessed 2026-10-21)
  25. Proofpoint: Third-party service providers and subprocessors (updated 14 October 2026; accessed 2026-10-21)
RelatedEmail security for small business (guide)Best email security for MSPsBest anti-phishing softwareSentaro vs Microsoft Defender for Office 365Microsoft 365 email securityPricing

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