Best 12 Email Security Solutions For MSPs (2026)

TitanHQ by CyberSentriq is a multi-layered email filtering platform built for SMBs and the MSPs that manage them. We think the price-to-protection ratio makes it the strongest all-round pick for MSPs managing SMB clients. Sandboxing and zero-day protection come included at base price, which matters when you compare against Barracuda and Mimecast add-on models.

TitanHQ by CyberSentriq Key Features

The M365 integration is 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. Outbound filtering and DLP round out the stack, with SPF, DKIM, and DMARC checks running automatically. For MSPs managing multiple tenants, the architecture scales without adding per-tenant complexity. At $1.95 per user monthly at 250 users, the margin math works for MSP billing models.

Our Take

We think TitanHQ, powered by CyberSentriq, is well worth considering if you’re managing email security across multiple SMB clients and want solid inbound filtering without per-tenant complexity. The pricing makes it easy to build into MSP billing models. If you need advanced outbound DLP or enterprise-scale threat intel integrations, you’ll want to look elsewhere. For straightforward email security you can deploy across clients without ongoing hand-holding, TitanHQ, powered by CyberSentriq, delivers.

Bitdefender Extended Email Security, built on the Mesh Security platform which was acquired by Bitdefender in July 2025, is an MSP-focused email security platform that provides strong protection across email environments, with the deepest coverage available for Microsoft 365. Bitdefender is sold as a single SKU, with consumption-based billing on active user inboxes.

Bitdefender Extended Email Security Key Features

Bitdefender provides granular multi-tenant management with a live tracker that shows every email across all customer tenants in one searchable view. If you want to investigate a single email, you can search by sender, subject or IP and find every time a particular message was delivered across all users, and remediate everywhere in just two clicks. This is a significant advantage over other solutions that would make you search each tenant individually.

You can also set global policy templates that apply across all of your clients. When you onboard a new customer, these templates are automatically applied. You can customize these policies as required for particular domains, or organizations.

Bitdefender can be deployed as an MX-based gateway, via API-only for Microsoft 365, or a combined gateway-plus-API option. Bitdefender recommends the third option for the best security for M365.

Our Take

We would recommend Bitdefender for MSPs running Microsoft 365 who are looking for email security with easy management of multiple clients from a single dashboard, with cost-effective single-SKU pricing. It’s an even better fit for teams that are already reselling Bitdefender endpoint security. Overall, Bitdefender offers a strong solution, and MSPs frustrated with the license complexity, cost, or complexity of their email security platform should evaluate this seriously.

Mailprotector is a cybersecurity company founded in 2000 that delivers cloud-based email security through its MSP partner network. Mailprotector Shield is a zero trust email security platform that uses machine learning to reduce spam, phishing, and inbox clutter while giving users direct control over their trusted senders.

Mailprotector Shield Key Features

Shield’s zero trust model filters emails by learning trusted sender patterns and routing unverified messages to junk. Users manage their trusted senders via New Sender Review, and the platform blocks high-volume spam and phishing through real-time behavioral analysis. Shield Pro adds Bundler, which summarizes non-critical emails into digests, and Lockbox, which secures sensitive messages with multi-factor authentication.

Spy Tracker Blocking removes email tracking pixels, and the multi-tenant dashboard with API support simplifies management across MSP client bases. The platform supports GDPR, HIPAA, and PCI DSS compliance requirements.

Our Take

We think Mailprotector Shield is a strong fit for MSPs seeking a zero trust email security platform that reduces spam and phishing without complex deployment. The user-driven trust model is effective against AI-generated spam where traditional rule-based filters struggle, and the multi-tenant dashboard keeps MSP administration straightforward.

Proofpoint Essentials is a market-leading email security solution for MSPs. Proofpoint secures more than 85% of the Fortune 100, and Essentials brings that same AI-powered detection to SMB clients at an accessible price point. We think it’s a strong fit for MSPs managing Microsoft 365 environments who want proven threat detection with bundled encryption, archiving, and continuity in one platform.

Proofpoint Essentials Key Features

The inline filtering deployment option gets you running in under five minutes without MX record changes, making client migrations straightforward. Spam and graymail detection is highly effective with minimal false positives. Proofpoint’s connection control checks sender IPs via Cloudmark, scanning over one billion messages per day. Predictive URL Defense sandboxes links before delivery, and the Advanced BEC Defense engine uses behavioral machine learning to detect impersonation attacks. Email warning tags flag external emails and DMARC failures with color-coded banners. One-click message pull lets admins remove delivered emails from inboxes fast. The admin console offers granular controls and solid reporting per tenant, and Filter Policies replace complex regular expressions with flexible, easy-to-configure rules.

Our Take

We found Proofpoint Essentials highly effective at blocking spam and phishing, with checks completing relatively quickly; it generally takes no more than 15 minutes to scan, sandbox, and deliver an unknown email with an attachment. The platform’s interface is simple and intuitive, which reduces per-client management overhead. With six pricing tiers from approximately $36 to $82 per user per year, it scales well across different client budgets. Proofpoint Essentials was designed for organizations up to 500 users but can be deployed effectively for larger businesses up to around 1,500 users. For MSP clients needing serious archiving or running at enterprise scale, Proofpoint Core Email Protection is worth evaluating instead.

IRONSCALES is an API-based email security platform that sits at the mailbox level inside Microsoft 365 or Google Workspace. It’s designed to catch inbound email threats, like phishing, BEC, and impersonation attacks, missed by traditional email gateways. It uses adaptive AI systems alongside end-user based threat intelligence to learn what malicious emails look like, and block them everywhere, all at once. We think it works well for MSPs who need fast client onboarding and low per-tenant management overhead.

IRONSCALES Key Features

IRONSCALES deploys via API with no MX record changes, meaning MSPs can onboard new clients without disrupting their mail flow. IRONSCALES Themis virtual SOC conducts investigation and remediation autonomously, providing admins context on email threats and reducing the per-tenant workload that eats into MSP margins. Employees can report a suspicious email with a single click, which is fed back into detection across the entire IRONSCALES customer base of over 17,000 organizations — so smaller clients benefit from threat intelligence gathered across your larger managed accounts.

IRONSCALES uses machine learning, AV engines, and URL scanning to provide strong protection against malicious links and attachments. The platform also provides spam filtering and grey-mail protection, meaning it can be used as a standalone replacement to a traditional email gateway. IRONSCALES builds a baseline of normal email behavior and flags suspicious email activity in real time, with dynamic warning banners placed on suspected email content. The platform offers built-in phishing simulations that use AI to mimic attackers’ real-world tactics, and deepfake meeting protection for video calls on Microsoft Teams.

Our Take

We are impressed by IRONSCALES. The platform is constantly adding new features, like email spam filtering, encryption, and deepfake protection. The core of the product is the crowdsourced threat intelligence built on end-user email reporting, which is an effective way of blocking phishing, alongside powerful threat protection engines. If you are an MSP looking for a dedicated email security tool that deploys quickly across client environments with built-in phishing awareness training, IRONSCALES delivers. The free Starter tier offers phishing simulation and testing for up to 500 mailboxes, though full email protection requires a paid plan.

Abnormal AI uses behavioral AI to build communication baselines for every user in your M365 or Google Workspace environment. We think the behavioral approach catches attacks other platforms miss, particularly BEC and social engineering that bypass traditional pattern-matching tools. The platform analyzes messages against 45,000+ threat indicators and deploys via API with no MX changes.

Abnormal AI Key Features

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. Campaign-level remediation pulls all related phishing messages after one is flagged, which saves MSP teams significant investigation time across client environments. The AI mailbox handles reported messages with low false positive rates.

What Customers Say

MSP teams consistently praise detection accuracy. Technicians report spending far less time managing email queues and chasing false positives compared to traditional gateways like Mimecast or Barracuda. Setup runs fast via API integration. Some customer reviews note that the interface needs better responsiveness, and outbound email monitoring is missing. Based on customer feedback, filtering settings don’t always persist between menus, creating friction when searching. Pricing sits at the premium end.

Our Take

We think Abnormal is well worth considering for MSPs whose clients face sophisticated social engineering attempts. The behavioral AI catches attacks that signature-based tools miss entirely, and the low false positive rates reduce alert fatigue across your managed accounts. It won’t suit clients using email platforms outside M365 or Google Workspace. For MSPs managing those environments, it delivers real operational efficiency alongside strong detection.

Check Point Email Security, formerly known as Harmony Email & Collaboration, provides API-based protection for M365 and collaboration platforms backed by Check Point’s threat intelligence network. We think the cross-channel scanning is the differentiator. The platform covers inbound, outbound, and internal communications for phishing, malware, ransomware, and zero-day exploits, with sandboxing, DLP, and encryption rounding out the stack.

Check Point Email Security Key Features

We found the ML-based phishing detection accurate. Zero-day and BEC detection identified 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. For MSPs, the cross-channel visibility across email, Teams, and shared files helps with audit and compliance reporting across client environments.

What Customers Say

Customers say the interface is simple and integration is quick. Account teams get strong marks for responsiveness. Organizations highlight how rarely emails bypass the filters during normal operations. Some customer reviews note that the reporting interface is difficult to work with for detailed analytics, and large attachment handling can cause performance issues at scale.

Our Take

We think Check Point Email Security fits MSPs managing clients on Microsoft 365 and collaboration tools who want unified protection from a single console. If your existing security stack already runs on Check Point, the integration story gets stronger. The DLP capabilities add visibility for clients where data loss prevention is on the roadmap. It’s well worth considering for MSPs expanding into broader workspace security.

Hornetsecurity 365 Total Protection is a cloud-based email security platform built for Microsoft 365 environments and the MSPs that manage them. Proofpoint completed its acquisition of Hornetsecurity in December 2025, adding enterprise distribution to a product already running in over 125,000 SMB deployments across 12,000+ MSP partners. We think the multi-tenant dashboard is where MSPs see the clearest value.

Hornetsecurity 365 Total Protection Key Features

Bulk policy application across all tenants cuts daily administration time. The Outlook add-in lets 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. Integration extends across Outlook, Teams, and SharePoint.

What Customers Say

Customers say the multi-tenant policy management is the standout operational benefit, and junk mail volumes drop sharply after rollout. Integration across Outlook, Teams, and SharePoint runs reliably with minimal training required. Some users report that reporting lacks the depth needed for thorough log reviews. Based on customer feedback, backup navigation makes locating specific restore points slower than expected, and initial setup requires real effort.

Our Take

We think Hornetsecurity 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. For multi-tenant efficiency and platform consolidation, it’s well worth considering.

Material Security protects the entire M365 and Google Workspace productivity suite, covering inbox data, account takeover, sensitive document exposure, and configuration drift. We think the approach to protecting stored inbox data is what separates Material from typical email security tools. If credentials get compromised, attackers still hit a wall accessing high-value messages.

Material Security Key Features

Instead of just blocking inbound threats, Material scans historical mail for sensitive data like tax records and invoices, then wraps that content with MFA. API deployment gets you running in under 30 minutes with no MX changes. Real-time remediation clusters similar malicious messages across your managed clients automatically, so your analysts spend less time hunting and more time responding. SIEM, SOAR, and identity tool integrations feed into your existing stack.

What Customers Say

MSP teams value the automatic clustering of similar malicious messages across client organizations. The Google Workspace integration gets praise as a first-class experience, not an afterthought. Support gets high marks for responsiveness and acting on feedback. Some customer reviews note that the ticketing dashboard needs polish for multi-client workflows, and initial setup can overwhelm less technical teams.

Our Take

We think Material is well worth considering 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. If clients need protection beyond cloud productivity suites, you’ll need to pair it with additional tools. For its target use case across managed M365 and Google environments, Material delivers.

Microsoft Defender for Office 365 is the native email and collaboration security layer built directly into the M365 stack. We think the deep ecosystem integration is the structural advantage here. Protection applies across Exchange Online, SharePoint, OneDrive, and Teams without additional configuration, and clients on E5 already have it bundled.

Microsoft Defender for Office 365 Key Features

Safe Links rewrites URLs at click time, Safe Attachments detonates suspicious files in a sandbox, and Automated Investigation and Response reduces manual workload for security teams. Real-time scanning catches phishing, malware, and zero-day exploits before they reach users. SIEM integration with tools like Splunk works smoothly. Plan 1 at $2 per user monthly covers the basics for client tenants. Plan 2 at $5 per user monthly adds investigation and response tools.

What Customers Say

MSPs consistently praise the ease of deployment across client tenants. Threat analysis reports help teams understand what’s hitting each client environment. Some customer reviews note that configuration and policy management complexity overwhelms new administrators. According to customer feedback, alert noise makes it difficult to distinguish high-priority threats from low-risk items.

Our Take

We think Defender 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. 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. We think the compliance bundle is the draw for MSPs whose clients need email security alongside archiving and eDiscovery. In March 2026, Mimecast launched full API deployment and expanded integrations to over 350 security vendors.

Mimecast Integrated Cloud Email Security Key Features

Scanning happens within the M365 tenant itself, catching internal threats that gateway solutions miss. Phishing, impersonation, and malware detection cover all mail directions. The DLP capabilities work well, with content examination filters for credit cards and SSN catching sensitive data in transit. Mimecast now connects with more than 350 security vendors across endpoint, XDR, SIEM, SOAR, and identity tools. CrowdStrike integration and the Outlook reporting plugin simplify investigation workflows.

What Customers Say

Customers say daily monitoring and policy management are straightforward, and 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 customer reviews note that archive retrieval requires Mimecast professional services if switching providers, which is worth weighing for MSPs managing client migrations.

Our Take

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. The March 2026 update addressing API deployment and 350+ vendor integrations strengthens the platform’s position in modern security stacks. It’s well worth considering for compliance-heavy MSP client bases.

Sublime Security is a programmable email security platform that replaces black-box detection with transparent, customizable rules. We think the rule-based approach is refreshing for MSPs with security engineers who want to own their detection logic across client environments. You see exactly why an email was flagged or blocked, with no guessing at vendor logic.

Sublime Security Key Features

Sublime’s MQL query language lets you write custom detections, build automated triage workflows, and integrate alerts into Slack or email. The AI-assisted policy builder combines MQL with GenAI to simplify rule creation without sacrificing control. Threat hunting capabilities with search and backtesting let you proactively find attacks that slipped through. The API integration connects email intelligence into your broader security platform alongside identity and endpoint detections. Over 700 built-in rules give teams a strong starting point.

What Customers Say

Customers say the POC experience is eye-opening, with multiple teams discovering threats their existing tools missed within days of deployment. Support earns consistent praise for responsiveness and technical depth. Some customer reviews note that the query language requires investment to use effectively for custom rules, and the post-delivery API model means emails can arrive in inboxes before scanning completes.

Our Take

We think Sublime fits MSPs with security engineers who want full visibility into detection logic and the ability to tune rules 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. Organizations wanting awareness training and broader tooling bundled in will need to pair Sublime with other vendors.