Best 10 Mimecast Alternatives For Email Security (2026)

• API integration with AI agentic automation and LLM analysis detects inbound email threats inside the inbox, protecting against VIP impersonation, BEC, and sophisticated attacks.
• Secures sensitive email content like one-time passcodes and confidential files already sitting in mailboxes, triggering additional authentication workflows if an account shows signs of compromise.
• File security permissions controls and identity security controls restrict what a compromised account can reach inside Google Workspace and Microsoft 365.
• Cloud workspace posture management and AI-powered OAuth app remediation identifies and revokes risky third-party tokens, including OAuth connections to AI tools that accumulate silently.
• Deploys in under 30 minutes via API with no MX record changes required.

Users highlight the account compromise protection features as a standout feature. They help by slowing attacks and limiting how much data an attacker can reach.

Customers also report that the automated remediation and phishing investigation capabilities are major time savers for security analysts. Reporting is straightforward, and users consistently call out the pace of product development and the responsiveness of the support team.

Some teams do find that rules configuration can be complex without dedicated email security expertise. But the Material support team is responsive.

Mimecast and tools like it do something real: they block a meaningful volume of inbound threats. The case for Material isn’t that your current tool doesn’t work; it’s that it’s solving an incomplete version of the problem. A gateway stops threats at the door. It has no answer for what happens when an attacker gets through, bypasses the perimeter entirely via OAuth, or compromises an account through session hijacking or MFA fatigue. Material is built for that part of the problem too: inbound protection, sensitive data lockdown, identity controls, and continuous OAuth monitoring working together across the full workspace.

If your team is looking for an alternative to Mimecast’s gateway model that addresses the full cloud workspace threat landscape along with stopping advanced email threats from hitting the inbox, this is a strong solution to consider.

• Machine learning with multi-layered detection catches inbound and outbound threats before they reach users.
• Dynamic classification of threats and graymail gives teams room to triage what actually matters.
• Granular policy and routing controls let you shape filtering logic to match how your organization sends mail.
• Integrated architecture announced March 2026 brings SEG and API-based protection into a single platform with shared threat intelligence across pre-delivery and post-delivery controls.

Customers say phishing attempts, suspicious links, and odd attachments get caught before they hit the inbox. The daily digest gets repeated praise for letting people clear spam in one click without dumping legitimate cold outreach. Some customer reviews note that the learning curve is steep, and dashboard navigation has come up as a friction point for day-to-day administration.

We were impressed by the visibility Proofpoint gives you into the people most targeted in your organization, which helps you focus security awareness training where it counts. If you’re moving off Mimecast or scaling beyond Microsoft’s native controls, Proofpoint is well worth considering. Smaller teams without dedicated email security headcount are better served by Proofpoint Essentials.

• Builds a behavioral baseline of how each user normally communicates, including identity, content, and tone, flagging unusual behavior the moment it appears.
• API deployment requires no MX record changes or policy authoring, collapsing multiple inbound stack layers into one platform.
• VendorBase supply chain protection detects invoice fraud and vendor impersonation using federated behavioral intelligence across your vendor ecosystem.
• Account takeover detection catches anomalous logins and locks accounts automatically.

Customers say phishing volume drops noticeably after rollout, and account takeover detection catches anomalous logins and locks accounts automatically. Setup gets repeated praise, with one team handling 90% of configuration in a single hour. According to customer feedback, the AI Phishing Coach module isn’t enterprise-ready yet, and false positives surface occasionally, with legitimate emails like invoices being routed to junk folders.

We think Abnormal fits security teams running Microsoft 365 or Google Workspace who want behavioral detection layered on native controls without admin overhead. If your inbound stack has grown messy and you want one platform doing the heavy lifting, this is a strong option to consider. If you need a traditional SEG with extensive custom policies, look elsewhere.

• API-based deployment inspects mail and messages after Microsoft or Google’s native filters run, catching what platform controls let through.
• Machine learning engine trained on email patterns spots phishing, BEC, account takeover, and ransomware attempts.
• Same detection engine extends into Slack, Teams, and OneDrive for consistent protection across communication channels.
• Triage interface is clear and quick to action when alerts pile up.

Customers say deployment takes minutes and starts blocking threats almost immediately. Phishing volume drops sharply after rollout, and the triage interface gets praise for being clear and quick to action when alerts pile up. Based on customer reviews, a mobile admin app would help with response outside business hours, but complaints beyond that are thin on the ground.

We think Check Point Email Security suits Microsoft 365 or Google Workspace teams who want phishing protection extending past email into Teams, Slack, and shared file storage. The API model fits teams who don’t want gateway redirection or another MX change. If you’re running hybrid mail with on-premises Exchange or need heavy custom policy authoring, a traditional SEG is a better fit.

• Covers spam, ransomware, BEC, spear phishing, and impersonation with add-ons for domain fraud protection, awareness training, and cloud archiving.
• Three plan tiers let you start at standard filtering and layer on DLP, encryption, and SaaS backup as needs grow.
• Premium Plus tier adds unlimited cloud archiving and security awareness training.
• Consolidates filtering, archiving, and backup into one platform with predictable management.

Customers say Barracuda has been stable over years of use, integrates cleanly with Microsoft 365, and runs with low management overhead even across multiple sites. Support gets repeated praise, with customers calling out direct phone access and fast resolution at first contact. Some customer reviews note that strict DKIM enforcement blocks legitimate mail from senders without registered domains, which causes friction in industries with smaller business partners.

We were impressed by the support experience, which consistently gets called out as a differentiator. If your customer base includes many senders without proper domain authentication, expect to spend time tuning. For everyone else, the platform stays out of your way. Barracuda is well worth considering if you want email security, archiving, and backup from a single vendor.

• AI, behavioral analytics, and machine learning catch phishing, BEC, ransomware, and malware in attachments.
• Built-in DLP, end-to-end encryption for mail in transit, and auto-remediation for threats that slip past initial filters.
• Deploys on-premises, in a VM, or as a cloud service, suiting regulated industries that need control over where mail data lives.
• Three tiered bundles scale from essentials to advanced threat protection.

Customers say the AI-driven detection catches advanced threats reliably, with auto-remediation and encryption picked out as strengths. The wider Cisco Secure portfolio gets credit as a flexible toolbox that integrates across multiple use cases. Based on customer reviews, configuration and troubleshooting can get more involved than expected, and support has come up as an area for improvement.

We think Cisco Secure Email is well worth considering if you’re already running Cisco gear and want the integration payoff across your security stack. The flexible deployment helps if you have on-premises or hybrid mail you can’t move. If you want a simpler cloud-native tool with minimal admin overhead, the Cisco stack is more than you need.

• Threat protection, DLP, and email encryption under a single policy model with uniform rules across cloud and on-premises mail.
• Granular controls define different policies per domain group with DKIM, DMARC, and SPF enforcement.
• Email server prioritization with MX failover provides continuity during outages alongside threat detection.
• Setup and administration stay flexible enough to switch between managed service partners without disruption.

Customers say setup and administration stay flexible enough to switch between managed service partners without disruption, and policy structures hold up over years of use. Support gets repeated praise, including help resolving issues that sat outside Forcepoint’s own environment. According to customer feedback, the anti-phishing engine and link scanning could be stronger, and on-premises performance has room to improve compared to the cloud experience.

We think Forcepoint Email Security suits organizations with hybrid mail estates, multiple domains, or strict policy governance needs. The DR options and granular policy design are genuine differentiators. But with the product reaching end of life, we’d recommend checking Forcepoint’s current support timeline before making a long-term commitment. If you’re looking for the strongest anti-phishing detection or a pure SaaS approach, other vendors on this list are ahead.

• Machine learning, AV engines, and URL scanning provide strong protection against malicious links and attachments.
• Spam filtering and grey-mail protection enable standalone gateway replacement with no MX record changes required.
• Crowdsourced intelligence from 17,000+ customer organizations feeds real-time detection via one-click employee reporting.
• Themis virtual SOC conducts autonomous investigation and remediation, providing admins context on email threats.
• Predictive red team agent scrapes an organization’s public footprint to generate likely attack scenarios.
• Built-in phishing simulations and deepfake meeting protection for Microsoft Teams.

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 looking to replace a traditional email gateway with a modern API-based platform that includes 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.

• Greylisting rejects incoming mail and asks the sender to retry, weeding out most spammers without complex policy work.
• Real-Time Blacklists and SURBL filters layer on top with sandbox protection included rather than priced as an add-on.
• TitanHQ claims a 99.98% spam catch rate and 99.99% phishing detection rate.
• Per-user costs sit well below most enterprise alternatives, with multi-year contracts trimming further.

Customers say the platform is easy to set up, easy to scale, and integrates cleanly with Microsoft 365. The Outlook plugin and daily quarantine reports get repeated mentions, and sandbox protection at no extra cost stands out against the competition. Based on customer reviews, the bayesian filter takes time to learn before catching spam reliably, and the daily report cadence isn’t customizable. Limited support hours and the lack of a mobile app have also come up.

We think TitanHQ is a good option to consider for SMBs and cost-sensitive teams. Multi-year pricing pushes per-user costs near the bottom of the category, and sandboxing is included where most competitors charge extra. If you’re an MSP running tightly separated tenants per customer, customers say the alias architecture isn’t a great fit. For SMBs and lean enterprises on a budget, SpamTitan holds its own.

• Inbound scanning for spam, malware, and phishing with a ranking system categorizing threats from authenticated to impersonation attack.
• API deployment across Microsoft 365 and Google Workspace with default protection live as soon as connected.
• AES 256-bit outbound encryption with recipient 2FA for HIPAA workflows and regulated information leaving your tenant.
• DLP rules configured to automatically encrypt outbound messages matching specific patterns, reducing human error.

Customers say setup is simple, the interface is intuitive, and HIPAA-compliant sending of PHI just works. MSPs running multiple Microsoft 365 and Google Workspace clients call out the multi-tenant filtering as a real win, alongside responsive support that listens to feature requests. According to customer feedback, the threat simulation product needs more depth and a monthly training cadence, and quarantine notification emails feel excessive with no opt-out at user level.

We were impressed by the consolidation of inbound filtering and outbound encryption into one platform, which replaces separate gateway and encryption tools. Pricing sits below most enterprise alternatives without thinning out core capability. If your encryption needs are minimal and you’ve got an established gateway, this is more than you need. For regulated industries handling PHI or sensitive data, Trustifi is well worth considering.