Best Cloud Email Security Tools

AppRiver is an email security vendor now operating under OpenText Cybersecurity after its acquisition by Zix and then OpenText. In the email-security scope, it is known for cloud-delivered filtering, phishing and malware blocking, and encrypted message delivery for organizations that want to protect Microsoft 365 and other email environments without deploying on-premises appliances. Its portfolio also includes adjacent compliance functions such as archiving and continuity, but the core buyer is typically a small-to-mid-sized business or managed service provider looking for managed email protection and encryption.

Avanan is an email security product now sold under Check Point’s Harmony Email Security line, focused on protecting Microsoft 365 and adjacent collaboration channels from phishing, business email compromise, malware, ransomware, and data leakage. It deploys as a cloud app with no MX-record change and is positioned for organizations that want inline and post-delivery controls without replacing their existing mail stack. Its main fit is for Microsoft 365 customers that need layered protection beyond native filtering, including account-compromise and data-loss controls.

Cisco Umbrella is a cloud-delivered Security Service Edge (SSE) solution that enforces zero trust by continuously verifying identity, device posture, and context before granting access to applications. It converges multiple security functions, secure web gateway, firewall-as-a-service, cloud access security broker, and zero trust network access, into a unified cloud platform. Cisco Umbrella serves enterprises requiring distributed security across remote workers, branch offices, and on-premises infrastructure without complete network architecture overhauls.

Most security stacks get unmanageably complex as your business grows. Coro consolidates endpoint, email, cloud, network, identity, data protection, and security awareness training into one unified platform.

Guardz is a unified cybersecurity platform that includes email security for MSP-managed SMB environments, with a focus on API-based mailbox protection, phishing/BEC/ransomware detection, and automated quarantine. In the email security scope, it scans user and shared mailboxes, flags suspicious messages and attachments, and supports sender/domain blocking and allowlisting. Guardz is best suited for MSPs that want email controls managed from the same console as broader identity and endpoint protections, rather than a standalone email gateway.

MailGuard, a GlobalGuard company, is a world leader in email security, providing both Secure Email Gateway (SEG) and Integrated Cloud Email Security (ICES) protection that detects and blocks sophisticated, fast-moving email threats hours ahead of the market.

Material Security secures the productivity suite by stopping attacks and reducing risk across Microsoft 365 and Google Workspace with unified cloud email and file security, data loss prevention and posture management.

N-able Mail Assure is a cloud-based email security gateway for MSPs and Microsoft 365 environments. In scope for email security, it filters inbound and outbound mail, blocks spam and email-borne threats, supports policy-based controls, and provides quarantine, archiving, and continuity functions through a web console. N-able positions it for service providers and IT teams that need centralized protection for multiple domains and tenants, plus message-level visibility and administrative reporting. Adjacent capabilities include a private portal for handling sensitive messages and Microsoft 365 add-ons, but the core product is email gateway protection.

Sophos defeats cyberattacks with an adaptive AI-native open platform and unmatched security expertise.

Spambrella is the best email security and continuity solution to strengthen your business reputation, encrypt sensitive data, and meet regulatory requirements. We provide effective email protection services and real-time cyber threat detection while spreading user awareness among stakeholders.

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