Best KnowBe4 DefendTM Advanced Inbound Email Threat Defense Alternatives & Competitors in 2026

Mailinblack Protect

Anti-spearphishing solution protecting orgs from targeted email attacks

IronVest InboxGuard

AI-powered email security with phishing detection and employee training

Guardz AI Multilayered Phishing Protection

AI-powered multilayered phishing protection combining email & web security

Cybersentriq Advanced Phishing Protection

AI-powered anti-phishing solution for Microsoft 365 environments

ID Agent Graphus

AI-powered anti-phishing platform for Microsoft 365 & Google Workspace.

TitanHQ PhishTitan

Phishing protection and remediation solution for Microsoft 365 environments

Egress Defend

AI-powered anti-phishing solution for Microsoft 365 with behavioral detection

GreatHorn Mailbox Intelligence

Email security tool empowering users to identify & report phishing threats

xorlab Abuse Mailbox Automation

Automates triage of user-reported suspicious emails with AI classification

Keepnet Incident Responder

AI-powered email incident response platform for phishing threat detection

Phriendly Phishing Phish Focus

Email triage solution with threat analysis and automation for phishing detection

ReliaQuest GreyMatter Phishing Analyzer

Automates phishing email analysis, remediation, and user response via AI

KnowBe4 PhishER Plus

Automated phishing incident response platform with threat categorization & removal

PhishingBox KillPhish

Email threat scanning and reporting add-in for Microsoft 365 and Google

Identity Automation PhishID

Browser-based phishing protection with AI-driven detection at point-of-click

IRONSCALES Protect

Email security platform combining AI and human insights for phishing protection

Kaseya Anti-Phishing Software

AI-powered email security solution that detects and blocks phishing attempts.

FirmGuardian Email Protection

Managed anti-phishing service combining AI detection with human analyst review.

Joe Sandbox Mail Monitor

Automated email monitoring tool for analyzing suspicious emails and URLs.

Obsidian Browser Ext. for SaaS Spear Phishing

Browser ext. that blocks SaaS spear phishing via real-time content analysis.

PIXM

Browser extension that detects phishing at point-of-click using AI & CV.

SpamTitan PhishTitan

ML-based phishing protection and remediation add-on for M365.

Detect-Phish

Reported Email Analysis & Response

Cofense Phishing Remediation

Post-perimeter phishing detection and automated remediation platform

Novacoast Phishing Monitoring

Managed service for email phishing monitoring and incident response

Lookout Phishing Protection

AI-based phishing protection for mobile devices across SMS, email, and apps

xorlab Contextual Banners

Contextual email banner system that alerts users to email threats

GoSecure Titan® Inbox Detection & Response (IDR)

Email security service for analyzing suspicious emails reported by users

NINJIO ALERT

Email add-in for one-click phishing reporting and threat analysis

Qevlar AI Phishing Solution

AI-powered phishing detection & response automation for SOC teams

PhishingBox Security Inbox

Phishing threat identification and mitigation tool for email security teams

Valimail Enforce

Automated DMARC enforcement platform for domain protection and email security

Valimail Monitor

Free DMARC monitoring tool for identifying email senders and authentication status

Red Canary Managed Phishing Response

Managed service for triaging and analyzing user-reported phishing emails

Netcraft DMARC Visualization

DMARC visualization tool for email domain protection and authentication

Threat Management

Phishing threat mgmt platform for reporting, analyzing & responding to threats

Graphus

Cloud email security platform focused on anti-phishing protection for orgs.

Havoc Shield Mail Armor Email Security

Email scanning service that analyzes forwarded suspicious emails for threats.

Lucy Security Engage Employees

Email phishing reporting plugin with incident analysis and threat mitigation.

PhishFirewall PhishEQ

API-based email security for M365/Google with auto-retraction of phishing threats.

GhostGuard

Browser extension for real-time phishing & impersonation detection with AI warnings.

Attic M365 FREE

Protects Microsoft 365 users from phishing attacks using fake login pages

Mimecast DMARC Analyzer

DMARC implementation & monitoring tool to prevent domain spoofing attacks

Splunk Attack Analyzer

Automated threat analysis platform for phishing and malware investigation

Valimail Domain Checker

Domain security checker for email authentication protocol verification

Repacket Phishing Prevention

Blocks phishing sites on employee devices using AI-based real-time classification.

Bitdefender Scamio

AI chatbot that analyzes texts, links, emails, and QR codes for scam detection

EAST Anti-Phishing Tool

Free anti-phishing tool for M365 that deploys via a custom CSS file in Entra.