Best 12 Email Security Solutions For MSPs (2026)

Cloud or on-prem email filtering built for SMBs and MSPs who need more than native Office 365 protection. The platform stacks multiple detection layers including sandboxing, link analysis, and CEO impersonation defense at a price point that undercuts the enterprise players.

Where TitanHQ Stands Out

We found the M365 integration straightforward. MX record change, basic policy setup, and you’re filtering. The multi-layered approach catches what Microsoft’s native filtering misses, particularly around phishing simulations and zero-day threats. Sandboxing comes included rather than as a costly add-on, which matters when comparing against Barracuda or Mimecast.

Outbound filtering and DLP round out the stack. SPF, DKIM, and DMARC checks run automatically. For MSPs managing multiple tenants, the architecture scales without drama.

What Customers Report

Setup gets consistent praise. The interface is clean and the daily quarantine digests make end-user self-service simple. Support response times are solid, though the European timezone coverage creates lag for teams in APAC or the Americas.

The spam filter needs time to learn your environment. Out of the box, expect false positives until users tag enough messages to train it. Users also flag that threat intel integration is missing. No VirusTotal scores or external enrichment in the dashboard, which adds investigation time.

Right Fit at the Right Price

At $1.95 per user monthly (at 250 users), the margin math works for MSP billing models. We think it’s ideal if you’re managing email security across multiple SMB clients and want solid inbound filtering without per-tenant complexity. If you need advanced outbound DLP or enterprise-scale features, you’ll want to look elsewhere.

For MSPs wanting straightforward email security they can deploy across clients without ongoing hand-holding, TitanHQ delivers.

Mailprotector Shield is a cloud-based email security platform built for MSPs and the organizations they manage. Its zero trust “circle of trust” model is the core idea: emails from unknown senders get routed to junk until users explicitly trust them, rather than relying purely on signature-based detection.

Zero Trust Filtering That Learns Your Inbox

Shield’s machine learning builds trusted sender patterns over time. Unverified senders hit the junk queue, not the inbox. We found this approach particularly effective against AI-generated spam, where traditional rule-based filters struggle to keep pace.

Shield Pro adds two features worth knowing about. Bundler consolidates low-priority emails into digest summaries, cutting inbox noise without deleting anything. Lockbox adds MFA to sensitive outbound messages, which is useful when you’re sending anything that shouldn’t land in the wrong hands.

What Customers Are Saying

Customers say the spam filtering is strong, and the administration interface is noticeably cleaner than competitors at this price point. Mail logging and detailed suspicious message reports give MSPs the visibility they need to handle end-user queries quickly.

Some users have noted that the sensitivity slider settings lack clear documentation, however.

Where Shield Fits Your Stack

We think Shield works best as a first-line filter for MSP-managed environments, particularly where reducing spam volume and maintaining compliance across multiple tenants is the priority. It handles GDPR, HIPAA, and PCI DSS requirements out of the box.

If your environment faces sophisticated phishing or targeted attacks, plan for a second layer. Based on our review, Shield earns its place in the stack and keeps the noise down so your team can focus on real threats.

Enterprise-grade email security scaled for SMBs. The platform bundles multi-layered threat detection with archiving, encryption, and DLP in one package. Deployment options include MX record redirection or inline filtering that gets you running in under five minutes.

Right-Sized Enterprise Protection

We found this hits the sweet spot for smaller organizations wanting Proofpoint’s detection quality without enterprise complexity. The same NexusAI technology powers threat detection here. Spam filtering catches what others miss, and the phishing catch rate outperforms many competitors.

The interface stays intuitive. User management, quarantine monitoring, and domain configuration work without fighting the system. Filter policies replace complex regular expressions with flexible, easy-to-configure rules. Log searches complete quickly, and you can release quarantined emails or add senders to allow lists directly from search results.

Deployment Flexibility

You can deploy as a traditional cloud gateway or connect via API without touching MX records, making client migrations straightforward. The admin console offers granular controls and solid reporting per tenant. The interface takes some getting used to, but the simplicity grows on you.

What Users Say Long-Term

MSP teams consistently praise the daily digest emails with single-click actions. One-click release or block saves real time versus manual triage, reducing per-client support overhead. The threat data available for investigations is extensive and useful for building broader detections.

The complaints cluster around the interface. Multiple admin consoles frustrate MSPs who want everything consolidated across clients. SIEM integrations and API support feel limited for teams running a centralized SOC. Sales support after implementation can disappear.

Right Fit for Growing Teams

If you’re an MSP wanting Proofpoint’s detection capabilities for SMB clients without enterprise complexity, this fits. You get proven threat intelligence at a fraction of the cost. Just know that advanced features live in higher tiers, and you’ll need patience with the interface consolidation.

API-based email security for M365 and Google Workspace environments. The platform combines machine learning with crowdsourced human threat intelligence to catch phishing and BEC attacks that slip past native defenses.

AI That Learns From Your Users

The platform’s differentiator is how it uses employee reports to train its detection engine. When an end user at any client site flags a suspicious email, that intelligence feeds back into the system across your entire managed base. We found the “report phish” button actually gets used because it’s simple and employees see results. Malicious emails get automatically pulled from inboxes organization-wide, often within minutes of the first report.

Integration is painless for client onboarding. No MX record changes required for Office 365 or G Suite deployments, so you can deploy across new clients without disrupting their mail flow or existing spam filters.

What Customers Are Saying

The admin portal gets consistent praise for clean UX and fast incident review. Customers report significant time savings on email remediation. The platform scales without requiring deep technical expertise to manage day to day.

Where It Fits Your Stack

We think IRONSCALES works best as a complement to whatever gateway your clients are already running, not a replacement. If clients need better spam filtering, you’ll want to pair it with a dedicated filter. If phishing, BEC, and social engineering are your pain points, this addresses them directly.

The crowdsourced approach means smaller clients benefit from threat intelligence gathered across your larger managed accounts and the broader IRONSCALES network. You’ll want this if your team struggles with phishing dwell time or needs to improve user reporting habits.

Behavioral AI that builds communication baselines for every user in your M365 environment. The platform analyzes messages against 45,000+ threat indicators to catch BEC, spear phishing, and account takeovers that pattern-matching tools miss. API integration means no MX changes.

Behavioral Detection That Delivers

We found the behavioral approach catches attacks other platforms miss. One customer reported catching close to seven figures in BEC attempts within the first two weeks. Night and day difference from native Microsoft settings, according to feedback.

When accounts get compromised, the platform forces logouts and triggers password resets automatically. URL rewriting and visual warning banners give users context without blocking everything. The AI mailbox handles reported messages with low false positive rates.

What Users Are Saying

MSP teams consistently praise detection accuracy. Technicians report spending far less time managing email queues and chasing false positives across client accounts compared to traditional gateways like Mimecast or Barracuda. Setup is straightforward, a few MX record changes and coordination with Abnormal’s team.

Users have flagged that the interface needs better responsiveness, and some want outbound email monitoring added. The filtering settings don’t always persist between menus, which creates friction when searching. Pricing sits at the premium end, though customers say the accuracy justifies it.

Best Fit for M365 and Google Shops

If you’re running M365 or Google Workspace clients and tired of babysitting email gateways across tenants, this deserves serious consideration. We think it’s particularly strong for MSPs whose clients face sophisticated social engineering attempts. The behavioral AI approach catches attacks that signature-based tools miss entirely.

It won’t suit clients using email platforms outside M365 or Google Workspace. But for MSPs managing those environments, it delivers real operational efficiency alongside strong detection.

Check Point provides API-based protection for M365 and collaboration platforms backed by Check Point’s threat intelligence network. The platform scans inbound, outbound, and internal communications for phishing, malware and ransomware, plus zero-day exploits. Sandboxing, DLP, and encryption round out the stack.

Detection That Catches What Others Miss

We found the ML-based phishing detection accurate. The platform catches malicious links and risky emails before they reach inboxes. Zero-day and BEC detection impressed in testing, identifying subtle threats that bypass native Microsoft protections. URL protection and sandboxing add depth. The API integration with M365 deploys without mail flow changes or complex setup. Centralized controls and granular policy management run from a single cloud console.

What Customers Are Saying

Users praise the simple interface and quick integration. Account teams get strong marks for responsiveness, even when customers pause deployments mid-process. Organizations highlight how rarely emails bypass the filters during normal operations.

Some customer reviews flag that the reporting interface is difficult to work with for detailed analytics, however.

Best for Expanding Digital Ecosystems

We think Harmony fits organizations already using or moving toward Microsoft 365 and collaboration tools who want unified protection. The DLP capabilities add visibility if data loss prevention is on your roadmap.

Cloudflare offers email protection built into Cloudflare’s SASE platform, backed by one of the largest global threat intelligence networks. The platform handles phishing, BEC, credential theft, and brand impersonation with post-delivery scanning and automated response workflows. Browser Isolation opens suspicious links in a sandboxed environment.

Threat Intelligence at Scale

We found the M365 API integration straightforward. One customer onboarded their entire organization in under an hour. The platform catches malicious emails before they reach inboxes, taking the detection burden off end users.

SIEM and SOAR integrations feed into existing security workflows. The dashboard provides useful visibility into top BEC attempts, spoofed accounts, and threat types. Pattern-based blacklisting and whitelisting give you control over filtering rules.

What Customers Are Saying

Users highlight the fast onboarding process and minimal ongoing maintenance. The Cloudflare ecosystem integration appeals to teams already using Cloudflare for DNS, CDN, or Zero Trust. Browser Isolation for suspicious links adds a layer most email-only tools lack.

Some customer reviews note that hybrid Exchange and M365 integration can be difficult to configure, however.

Best Fit for Cloudflare-First Environments

We think Cloudflare Email Security fits MSPs already invested in the Cloudflare ecosystem who want email protection without adding a standalone vendor. The Browser Isolation capability is a differentiator for environments where users frequently click links. If you need deep archiving or compliance tools, you’ll need to pair it with another platform.

Hornetsecurity 365 Total Protection is a cloud-based email security platform built for Microsoft 365 environments and the MSPs that manage them. Proofpoint acquired Hornetsecurity in May 2025, adding enterprise distribution to a product already running in over 125,000 SMB deployments.

Multi-Tenant Management Across the Full M365 Stack

The multi-tenant dashboard is where MSPs see the clearest value. Bulk policy application across all tenants cuts daily administration time. We found the Outlook add-in well designed. Users report suspicious emails from within their inbox, without needing a separate tool. The platform covers spam filtering, backup, archiving, encryption, and permission management in one interface. Hornetsecurity claims 99.99% spam detection and 99.9% virus detection, with a real-time Advanced Threat Protection sandbox. AI risk scoring helps teams triage flagged emails without reading each one individually.

Customers Say Consolidation Works, Setup Takes Effort

Customers say integration across Outlook, Teams, and SharePoint runs reliably with minimal training required. Multi-tenant policy management comes up consistently as the standout operational benefit. Users report junk mail volumes dropping sharply after rollout.

Some users report that reporting lacks the depth needed for thorough log reviews, however. Backup navigation draws consistent criticism: tracking down specific restore points takes more clicks than expected. Some customers say initial setup requires real effort, and API functionality needs development for tighter custom integrations.

A Solid Bet for Microsoft 365-Heavy MSP Stacks

We think this is a strong fit for MSPs running Microsoft 365 environments who need email security, backup, and permissions consolidated in one platform. The Proofpoint acquisition adds enterprise credibility and should expand global integration options over time. If your environment sits outside Microsoft 365, look elsewhere. Based on our review, this platform earns its place where multi-tenant efficiency and platform consolidation are the priority.

Material protects the entire M365 and Google Workspace productivity suite, covering inbox data, account takeover, sensitive document exposure, and configuration drift. API deployment gets you running in under 30 minutes with no MX changes.

Beyond the Inbox

This platform takes a different angle. Instead of just blocking inbound threats, it scans historical mail for sensitive data like tax records and invoices, then wraps that content with MFA. If credentials get compromised, attackers still hit a wall accessing high-value messages.

We found the phishing and BEC detection solid, combining AI with human threat research. Real-time remediation clusters similar malicious messages across your org automatically. Your analysts spend less time hunting and more time responding.

Analyst and Leadership Visibility

The metrics and reporting make leadership conversations easier. Dashboards show user actions on flagged emails and current threat state at a glance. SIEM, SOAR, and identity tool integrations feed into your existing stack.

Customers consistently praise the Google Workspace integration as first-class, not an afterthought. Support gets high marks for responsiveness and acting on feedback. The report suspicious button works simply enough that end users actually use it.

What Customers Are Saying

MSP teams value the automatic clustering of similar malicious messages across client organizations. You can remediate at scale without manual investigation at each client site. The user-facing “report suspicious” button is simple enough that employees actually use it.

Some MSP admins flag that the ticketing dashboard needs polish for multi-client workflows, however.

Does it Fit Your Environment?

We think Material makes sense if you’re managing M365 or Google Workspace clients and want one platform covering email, data, and identity risks per tenant. It treats Google Workspace as a first-party integration, not an afterthought. Deployment takes under 30 minutes with no MX record changes.

If clients need protection beyond cloud productivity suites, you’ll need to pair it with additional tools. But for its target use case across managed M365 and Google environments, Material delivers.

Microsoft provides email and collaboration protection built directly into the M365 stack. No third-party integration required. The platform covers Exchange Online, SharePoint, OneDrive, and Teams with AI-driven threat detection, Safe Links, Safe Attachments, and automated investigation and response.

The Native Advantage

We found the deep ecosystem integration valuable for teams already committed to Microsoft. Protection applies across all collaboration tools without additional configuration. Real-time scanning catches phishing, malware, and zero-day exploits before they reach users.

The Automated Investigation and Response feature reduces manual workload for security teams. Actionable insights rather than generic alerts help analysts prioritize what matters. SIEM integration with tools like Splunk works smoothly. Cloud deployment keeps implementation simple.

What Customers Are Saying

MSPs consistently praise the ease of deployment across client tenants. The threat analysis reports help your team understand what’s hitting each client environment. Real-time detection catches most of what you’d expect it to catch.

Some customer reviews note that alert noise makes distinguishing high-priority threats from low-risk items difficult, however.

Right Fit for Your Environment

Plan 1 at $2/user/month covers the basics for client tenants. Plan 2 at $5/user/month adds investigation and response tools. Clients on E5 already have it bundled, which simplifies your licensing conversation.

We think this works well for MSPs whose clients are standardized on Microsoft. The native integration is hard to beat, and you avoid adding another vendor to your stack. If you need granular policy control or face sophisticated, targeted attacks, a dedicated third-party solution alongside it adds value. But for most M365 environments, this delivers solid protection without adding complexity.

Mimecast provides API-based M365 protection that scans inbound, outbound, and internal email traffic without touching your MX records. The platform bundles threat detection with compliance tools including archiving and e-discovery, plus encryption. Security awareness training integrates directly.

In-Tenant Scanning Done Right

We found the direct M365 integration simplifies deployment significantly. Scanning happens within the tenant itself, catching internal threats that gateway solutions miss. Phishing, impersonation, and malware detection cover all mail directions.

The DLP capabilities work well. Content examination filters for credit cards and SSN catch sensitive data in transit. CrowdStrike integration simplifies investigations. The Outlook reporting plugin lets users escalate suspicious messages quickly.

What Customers Are Saying

Customers say daily monitoring and policy management are straightforward, and the phishing protection runs with low noise. Small security teams praise the out-of-the-box effectiveness. Implementation with M365 draws positive feedback for minimal disruption.

Some users report that SIEM integration requires more configuration steps than expected, however.

Best Fit for Compliance-Heavy MSP Clients

We think Mimecast fits MSPs whose clients need email security bundled with compliance tools. If archiving, eDiscovery, and encryption are on the requirements list alongside threat detection, this consolidates what would otherwise be three or four separate vendors into one platform.

Sublime Security is a programmable email security platform that replaces black-box detection with transparent, customizable rules. The platform uses its own query language (MQL) to evaluate emails and apply actions based on administrator-defined policies. Built for security teams who want full visibility into why decisions get made.

Transparency That Changes the Game

We found the rule-based approach refreshing. You see exactly why an email was flagged or blocked. No guessing at vendor logic. The AI-assisted policy builder combines MQL with GenAI to simplify rule creation without sacrificing control.

Threat hunting capabilities stand out. Search and backtesting let you proactively find attacks that slipped through. The API integration means you can weave email intelligence into your broader security platform alongside identity and endpoint detections.

What Customers Are Saying

Users highlight the POC experience as eye-opening. Multiple teams describe discovering threats their existing tools missed within days of deployment. Support earns consistent praise for responsiveness and technical depth throughout implementation and production.

Some customer reviews note that the query language requires investment to use effectively for custom rules, however.

Ideal for Hands-On Security Teams

We think Sublime fits MSPs with security engineers who want to own their detection logic across client environments. If your team prefers transparency over convenience, this delivers. The free tier for single accounts lets you evaluate before committing to enterprise pricing.