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

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

InSAT Security Inbox

Centralized platform for reporting, analyzing, and responding to email threats

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

Enea Messaging Security

Messaging security platform for mobile operators to block spam and fraud

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.

Humanix

Detects social engineering attacks via AI analysis of voice, chat, and video.

Joe Sandbox Mail Monitor

Automated email monitoring tool for analyzing suspicious emails and URLs.

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

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

Guardio Protection Plan

Browser & mobile security solution with phishing protection & data leak alerts

Guardio Safe Browsing

AI-based real-time security engine for blocking web threats in browsers & agents

Red Canary Managed Phishing Response

Managed service for triaging and analyzing user-reported phishing emails

Threat Management

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

Apozy Airlock NoHack

Neural network-based zero-day phishing & malvertising detection via global sensor network.

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.

Frame Security Phishing Triage

AI-powered phishing triage platform for analyzing employee-reported emails.

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

Valimail Domain Checker

Domain security checker for email authentication protocol verification

Abusix Email Threat Protection

Real-time email threat blocking via RBL/DNSBL blocklists for mail servers.

Repacket Phishing Prevention

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

Repacket Unsafe Content Filtering

Packet-level content filtering blocking phishing & unsafe content on devices.

Bitdefender Scamio

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

Malwarebytes Browser Guard

Browser extension blocking ads, trackers, malware, phishing & scams

EAST Anti-Phishing Tool

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