Phishing protection works best in layers: email controls can block or flag suspicious messages, staff training and reporting can help people spot attacks, and phishing-resistant sign-in methods can make stolen passwords less useful. These 10 companies cover different parts of that job. They are a non-ranked shortlist, not interchangeable products or a guarantee against every attack.
How to choose phishing protection
Start with the email service your organization already uses. Microsoft and Google document protections built into their cloud email platforms; several other providers offer additional controls for Microsoft 365, Google Workspace, or both. Then compare what each product covers and how it is deployed.
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- Threat coverage: Check for spoofing and impersonation, business email compromise (BEC), malicious links and attachments, QR-code attacks, and threats delivered through collaboration tools.
- Timing and response: Ask whether the service inspects messages before delivery, can identify threats after delivery, and supports removal or remediation.
- Deployment and administration: Determine whether the product uses the platform’s native controls, an API connection, mail routing, or a hybrid setup—and what configuration and ongoing work that entails.
- People and sign-ins: Decide separately whether you need awareness training, phishing simulations, a suspicious-message reporting workflow, or stronger authentication.
- Evidence and licensing: Confirm current features, plan eligibility, geography, and compatibility. Vendor feature descriptions and performance claims are not independent test results; the sources cited here do not establish comparable detection rates, false-positive rates, prices, or implementation effort.
10 companies and the roles they play
| Company | Role and documented fit | What to verify |
|---|---|---|
| Microsoft | Native cloud-mail protections and, with Microsoft Defender for Office 365, additional impersonation controls, campaign views, and attack simulation training. | Features depend on service and plan; check the organization’s current entitlement. |
| Gmail and Google Workspace controls for spam, warnings, attachments, links, external images, spoofing, and authentication. | Review administrator settings and the protections included in the Workspace edition. | |
| Proofpoint | Cloud email security addressing phishing, BEC, account takeover, malware, and credential theft across the email lifecycle. | Assess coverage and terms directly; its published performance figures are vendor claims, not independently validated comparisons in the sources cited here. |
| Mimecast | Email lifecycle protection and remediation, contextual risk banners, and documented QR-code phishing and BEC coverage; deployment options include cloud, on-premises, and hybrid environments. | Confirm integration and configuration fit for the mail environment in use. |
| Cloudflare | Email and collaboration-channel protection described for phishing, BEC, malware, and ransomware, including Slack, Microsoft Teams, SMS, and social platforms. | Its described deployment options include MX-record routing, API deployment for Microsoft 365 and Google Workspace, or a hybrid approach; verify the intended architecture. |
| Cisco | Secure Email Threat Defense documents protection for phishing, BEC, malicious QR codes, ransomware, and account takeover. Cisco describes ETD Advantage as gateway protection for pre-delivery inspection. | Confirm the relevant product, subscription, and availability for the organization’s location and environment. |
| Barracuda | Integrated Email Protection is described as an API-based service for Microsoft 365 and Google Workspace, with message analysis, post-delivery detection, and automated response. | Validate the claimed capabilities and response workflow against operational needs. |
| KnowBe4 | Defend is described as inbound threat defense for Google, Microsoft, and Teams. KnowBe4 also documents awareness training, phishing tests, notifications, and suspicious-message reporting. | Distinguish the Defend email product from training and simulation services when comparing scope. |
| Okta | FastPass and FIDO2 WebAuthn passkeys are documented as phishing-resistant authentication methods. This is a sign-in control, not an email gateway. | Check device, identity-engine, and application-policy compatibility. |
| Abnormal Security | A 2025 KuppingerCole report hosted by Cisco describes its solution as cloud-native and API-based, integrating with Microsoft 365 and other security analytics tools. | The available evidence here is an industry report rather than a current official product page; verify current product scope. |
What each company offers
Microsoft: native controls plus optional extensions
Microsoft says organizations with cloud mailboxes have built-in spoof intelligence, anti-phishing policies, and implicit email-authentication protections. Microsoft Defender for Office 365 adds configured impersonation protection, campaign views, and attack simulation training, but the available feature set depends on the service and plan. Microsoft Learn defines phishing as “an email attack that tries to steal sensitive information in messages that appear to be from legitimate or trusted senders.” (Microsoft Learn, Anti-phishing protection.)
Google: Gmail protections and administrator settings
Google Workspace administrator documentation describes default Gmail warnings and spam placement, along with configurable controls for attachments, links, external images, spoofing, and authentication. Google also promotes passkeys and FIDO2 security keys as account-protection measures. On its Workspace page, Google says more than 99.9% of spam, phishing attempts, and malware are automatically blocked in Gmail. That is a Google-published figure, not an independently established result or a promise for every organization. The same page reports an 84% increase in email-delivered infostealers in 2024 compared with the prior year; that is also Google’s figure and comparison. (Google Workspace Admin Help; Google Workspace security.)
#1 Best Overall
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Proofpoint: lifecycle-focused email security
Proofpoint describes cloud email security for phishing, BEC, account takeover, malware, and credential theft, with analysis across the email lifecycle. Its product page claims Core Email Protection blocks 99.999% of advanced email threats and detects 27% more novel threats than leading competitive solutions. The cited material does not establish the methodology or comparison conditions, so these figures should be treated as Proofpoint’s marketing claims rather than head-to-head evidence. (Proofpoint email protection; Proofpoint Core Email Protection.)
Mimecast: remediation and varied deployment environments
Mimecast describes protection and remediation across the email lifecycle, contextual risk banners, and coverage for QR-code phishing and BEC. Its documented deployment options include Microsoft 365, Google Workspace, on-premises, and hybrid environments. Confirm that the specific integration and configuration suit the organization’s setup. (Mimecast Email Security.)
Cloudflare: email plus collaboration channels
Cloudflare describes protection against phishing, BEC, malware, and ransomware, including attacks through Slack, Microsoft Teams, SMS, and social platforms. Its product page describes inline deployment through MX records, API deployment for Microsoft 365 and Google Workspace, or a hybrid approach. These are vendor-described features and deployment models, not independently tested outcomes. (Cloudflare email security.)
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- Security Key : Protect your online accounts against unauthorized access by using FIDO2 and U2F authentication with T110. It's the world's most protective security key that works with windows, Mac OS, Linux as well as Chrome, Firefox, Edge and many other major browsers.
- Certified with the new FIDO2 standard, T110 provides the benefit of fast login and strong protection against phishing, account takeover as well as many other online attactks.
- Works with : Bank of America, Github, Google, Microsoft, DUO, Twitter, Facebook, Dropbox, Apple, ebay, BINANCE, mor and more.
- Fits USB-A port : Insert the T110 security key into the USB-A port of each service and log in conveniently with one touch
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Cisco: cloud mailbox protection or gateway inspection
Cisco’s Secure Email Threat Defense data sheet lists protections for phishing, BEC, malicious QR codes, ransomware, and account takeover. Cisco distinguishes that cloud mailbox-oriented service from ETD Advantage, which it describes as gateway protection for organizations seeking pre-delivery inspection. Check product and subscription availability for the intended geography and environment. (Cisco Secure Email Threat Defense data sheet.)
Barracuda: API-based protection for cloud mail
Barracuda describes Integrated Email Protection as an API-based service for Microsoft 365 and Google Workspace. Its page says the service analyzes message intent, links, identity behavior, and content, and provides post-delivery detection and automated response. Those are Barracuda’s product claims; the cited material does not independently test them. (Barracuda Integrated Email Protection.)
Rank #3
- A FIDO security key with PUF technology provides a unique, hardware-rooted trust anchor that resists tampering and cyber attacks, offering stronger security than conventional designs.
- FIDO2 Certified Protection – Enjoy phishing-resistant security with FIDO2 certification, ensuring top-tier account safety across Windows, macOS, Linux, iOS iOS, Android and more.
- Easy to use & Portable – Designed with a compact USB-C interface, Clife key fits easily on your keychain for secure access anywhere. Simply plug in and authenticate with ease.
- Universal Compatibility – Works seamlessly with hundreds of FIDO2/U2F compliant services, including popular cloud, email, and social platforms.
- Backup recommended – To ensure continuous access, register a backup Clife security key as a spare in case your primary key is lost.
KnowBe4: keep email defense distinct from training
KnowBe4 describes Defend as inbound threat defense for Google, Microsoft, and Teams. Separately, its Google Workspace setup documentation covers phishing security tests, training notifications, a suspicious-message reporting button, and integration. When comparing options, establish whether you are evaluating message filtering, user awareness and simulation, or both. (KnowBe4 Defend; KnowBe4 Google Workspace Integration Setup Guide.)
Okta: make compromised passwords less decisive
Okta documents FastPass and FIDO2 WebAuthn passkeys as phishing-resistant authenticators. Authentication helps protect sign-ins if credentials are targeted, but it does not filter incoming messages. Verify supported devices, identity configuration, and application policies before choosing an approach. (Okta phishing-resistant authentication.)
Recommended Free Tools
Rank #4
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Abnormal Security: verify current scope
A 2025 KuppingerCole Leadership Compass report hosted by Cisco describes Abnormal Security’s solution as cloud-native and API-based, integrating with Microsoft 365 and other security analytics tools. Because that description comes from the report rather than a current official Abnormal product page, confirm current features and integrations with the vendor. (2025 KuppingerCole Leadership Compass report.)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do you need email security, training, or both?
Email filtering and user training address different parts of the problem. Filtering aims to reduce suspicious messages reaching users; training and simulations help users recognize and report messages that get through. Microsoft documents attack simulation training, and KnowBe4 describes both awareness services and its separate Defend email product. A reporting workflow can help employees escalate suspicious mail rather than deciding alone whether it is safe.
Best Value
- Ultra-Compact FIDO2 Security Key - Plug-and-stay or carry on a keychain. This USB-A hardware security key offers portable, always-on protection for desktop and mobile use. (Item Size: 0.75 X 0.74 IN x 0.25 IN)
- USB-A Hardware Key for All Devices - Works with USB-A ports on PC, Mac, Android, and other laptop/notebook device. Enables secure, cross-platform login with FIDO2.0 passkey support.
- FIDO Certified Security Key - Meets FIDO and FIDO2 standards. Works with Google, Microsoft, GitHub, Dropbox, and more. Please check service compatibility before purchase.
- Passwordless Login with Passkey - Supports passkey login via WebAuthn and CTAP2. Enjoy password-free sign-ins where supported. Not all websites or services currently support passkeys.
- Advanced Multi-Factor Authentication - Offers 200 FIDO2 passkey slots and 50 OATH-TOTP slots. Strong, flexible 2FA/MFA support across various apps and authentication platforms.
How phishing-resistant sign-in helps
Phishing-resistant authentication is another layer, not a replacement for email protection. Google names FIDO2 security keys among its account protections, while Okta documents FastPass and FIDO2 WebAuthn passkeys as phishing-resistant methods. A FIDO2 security key may be useful where organizational sign-in systems support it, but check device and identity-provider compatibility and policy before purchasing hardware.
Quick Recap
A practical shortlist process
- Record your mail setup. Note whether the organization uses Microsoft 365, Google Workspace, on-premises mail, or a hybrid environment.
- Map current coverage. Identify which native controls are enabled and which plan entitlements apply before adding another service.
- Define the gaps. Specify whether the priority is impersonation and BEC, links and attachments, QR codes, post-delivery cleanup, collaboration channels, training, reporting, or sign-in security.
- Compare deployment and operations. Ask vendors how inspection works, what integrations are required, how administrators handle alerts and remediation, and what staff must maintain.
- Validate claims and terms. Request the methodology behind performance claims, confirm licensing and regional availability, and assess false positives and implementation needs in your own environment.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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