Best KnowBe4 Cloud Email Security Alternatives & Competitors in 2026

ConnectWise Email Security

Email security platform with AI threat detection, BEC protection, and DLP

Cellopoint Cloud Email Security Solution

Cloud-based email security platform protecting against phishing, ransomware, BEC

ESET Cloud Office Security

Cloud email security for Microsoft 365 and Google Workspace applications

Bitdefender GravityZone Extended Email Security

Cloud-native email security platform with SEG and API-based protection

Mesh 365

API-based email security platform for Microsoft 365 environments

Vade (Hornetsecurity) 365 Total Protection

AI-powered email security platform for Microsoft 365 with backup & compliance.

Microsoft Defender for Office 365

Email and collaboration security for Microsoft 365 environments

INKY Behavioral Email Security Platform

Behavioral email security platform protecting inbound, outbound, and internal mail

odix FileWallTM for Microsoft 365

File-based threat protection for Microsoft 365 using CDR technology

Broadcom Symantec Email Security

Enterprise email security platform for cloud and on-premise deployments

SourcetekIT Email Security Service

Managed email security service for Office 365 using Cisco's platform.

Upfort

Unified AI-powered cybersecurity & cyber insurance platform for SMBs.

Cisco Secure Email Threat Defense

Email threat protection for Microsoft 365 with advanced detection capabilities

Fortinet FortiMail Email Security

AI-powered email security platform protecting against phishing, BEC, and ATO

Hornetsecurity 365 Total Protection

Comprehensive M365 security suite with email protection, backup, and compliance

Hornetsecurity Advanced Threat Protection

AI-powered email security platform protecting against advanced threats

SorbSecurity Cloud Email Security

Cloud-based email security platform protecting against phishing & ransomware

Mimecast Advanced Email Security

Email security platform protecting M365 & Google Workspace from threats

MX Layer Email Security

Cloud-based email security platform with AI-powered threat detection

ESET Mail Security

Email security for Microsoft Exchange servers with anti-spam and anti-malware

OPSWAT MetaDefender Email Security

Email security platform protecting against phishing, malware, and exploits

TitanHQ Cybersecurity Bundles

Bundled cybersecurity solutions for MSPs and end users with email protection

VIPRE Integrated Email Security (IES)

Email security platform for Microsoft 365 with AI-based threat detection

Egress Intelligent Email Security

Cloud email security platform for inbound/outbound threat detection & DLP

Mimecast Collaboration Threat Protection

Secures Microsoft Teams, SharePoint & OneDrive from malware and phishing

Cybersentriq MX Email Threat Protection

MX-based email security platform using AI to block spam, phishing & malware

SpamExperts Incoming Email Filtering

Email filtering service protecting against spam, viruses, and phishing.

Vircom Email Security

Email security platform enhanced with multi-tenant mgmt & automation tools

Mailinblack U-Cyber 360°

Comprehensive email security & human risk mgmt platform with AI-powered protection

Abnormal Security Cloud-based email security platform

AI-powered email security platform protecting against phishing, BEC, and ATO

GLIMPS Email Security for M365

AI-based email security for M365 with phishing, BEC & malware detection.

SpamTitan

Cloud-based anti-spam and antivirus email filtering with AI threat detection.

Ocean Agentic Email Security Platform

Agentic AI email security platform that investigates emails pre-delivery.

Sophos Email

Email security platform with phishing/BEC protection and MDR/XDR integration

GreatHorn Email Security

Cloud-native email security platform for phishing detection and response

Trustifi AI Powered Email Security

AI-powered email security platform for threat detection and compliance

Proofpoint Threat Protection

Email security platform with AI-based threat detection and DLP capabilities

TitanHQ SpamTitan

Email security platform blocking spam, phishing, malware, and viruses

Fortra Email Security & Anti-Phishing

Email security platform protecting against phishing, BEC, and data loss

MX Layer Email Compliance

Email compliance and archiving solution with DLP and threat protection

ThreatDown Email Security

AI-powered email security platform for phishing and BEC protection

Infonaligy Proofpoint Email Security

Managed Proofpoint email security service for phishing & BEC protection.

MailGuard Email Security

Cloud-based email filtering blocking phishing, malware, spam & BEC attacks.

MailGuard

Cloud-based managed email filtering against phishing, ransomware & BEC.

TitanHQ Security Bundles

Tiered cybersecurity bundles combining email, DNS, backup & SAT.

SpamTitan for Office 365

Email security layer for M365 with anti-phishing, sandboxing, and DLP.

AI-Powered Email Security & DMARC Protection

AI-powered DMARC monitoring and email authentication security platform

Cloudflare Cloud Email Security

Cloudflare Cloud Email Security is a cloud-based email protection service that safeguards organizations against phishing, malware, spam, and other email-borne threats through integrated threat detection and prevention capabilities.