# Top Free Email Anti-spam Software - Page 3 ## How Many Email Anti-spam Software Products Does G2 Track? **Total Products under this Category:** 121 ### Category Stats (Aug 2026) - **Average Rating:** 4.46/5 The average rating of products in this category, based on all submitted ratings - **Top Trending Product:** INKY Email Security Platform (+1.43%) - Among all products in this category, INKY Email Security Platform recorded the largest rating increase compared to last month _Last updated: August 05, 2026_ ## How Does G2 Rank Email Anti-spam Software Products? **Why You Can Trust G2's Software Rankings:** - 30 Analysts and Data Experts - 6,300+ Authentic Reviews - 121+ Products - Unbiased Rankings G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category. ## G2 Grid® for Email Anti-spam Software ![G2 Grid® for Email Anti-spam Software plotting products by satisfaction and market presence](https://www.g2.com/categories/email-anti-spam/grids.png?focus%5B%5D=30562&focus%5B%5D=112257&focus%5B%5D=115555&focus%5B%5D=15605&focus%5B%5D=30571&focus%5B%5D=118732&focus%5B%5D=25519&focus%5B%5D=129100) Highlighted products: Proofpoint Core Email Protection, Check Point Email Security, Microsoft Defender for Office 365, SaneBox, Valimail, Abnormal AI, Paubox, and Libraesva Email Security. Underlying data: [Grid® JSON](https://www.g2.com/categories/email-anti-spam/grids.json?focus%5B%5D=proofpoint-core-email-protection&focus%5B%5D=check-point-email-security&focus%5B%5D=microsoft-microsoft-defender-for-office-365&focus%5B%5D=sanebox&focus%5B%5D=valimail&focus%5B%5D=abnormal-ai&focus%5B%5D=paubox&focus%5B%5D=libraesva-email-security) **Sponsored** ### IPinfo IPinfo is a comprehensive IP data provider for high-confidence, accurate, low down-time, low-latency, easy-to-use, and highly-contextual data about IP addresses backed by a proprietary ground-truth measurement infrastructure. IPinfo specializes in delivering detailed IP Data, including IP to geolocation, IP to mobile carrier information, IP to privacy detection, IP to proxy identification, and more. By leveraging this data, businesses and developers can enrich their data, improve their product, enhance their decision-making processes, improve security measures, and ensure compliance with regulatory standards. The target audience for IPinfo spans a wide range of users, from individual developers to large enterprises, including Fortune 500 companies. These users rely on IP data for various applications, such as fraud prevention, targeted marketing, and customer experience optimization. With the increasing importance of data-driven insights in today’s digital landscape, IPinfo serves as a vital resource for organizations looking to harness the power of IP intelligence. One of the standout features of IPinfo is its robust API, which processes over 1 billion requests daily. This high volume of data requests demonstrates the platform's reliability and scalability, making it suitable for businesses of all sizes. Additionally, users can access data through direct downloads and leading cloud platforms, ensuring flexibility in how they integrate IP information into their systems. The platform is backed by a dedicated team of data experts who prioritize accuracy and precision, further enhancing the value of the service. IPinfo’s key features include real-time IP geolocation, which allows users to pinpoint the physical location of an IP address, and mobile carrier identification, which helps businesses understand the network providers their users are utilizing. Our data also offers privacy detection capabilities, enabling organizations to identify potential risks associated with anonymous browsing or proxy usage. These features collectively empower users to make informed decisions, mitigate security threats, and tailor their services to meet the needs of their customers effectively. By providing highly contextual and accurate IP data, IPinfo stands out in its category as a trusted partner for organizations seeking to leverage internet intelligence. Our data not only enhances operational efficiency but also plays a crucial role in shaping better customer interactions and experiences. [Visit website](https://www.g2.com/external_clickthroughs/record?secure%5Bad_program%5D=ppc&secure%5Bad_slot%5D=category_product_list_llm&secure%5Bcategory_id%5D=1628&secure%5Bchosen_at%5D=2026-08-07T03%3A31%3A30Z&secure%5Bdisplayable_resource_id%5D=494&secure%5Bdisplayable_resource_type%5D=Category&secure%5Bmedium%5D=sponsored&secure%5Bplacement_reason%5D=retargeted_product&secure%5Bplacement_resource_ids%5D%5B%5D=100459&secure%5Bprioritized%5D=false&secure%5Bproduct_id%5D=100459&secure%5Bresource_id%5D=1628&secure%5Bresource_type%5D=Category&secure%5Bsource_type%5D=category_page&secure%5Bsource_url%5D=https%3A%2F%2Fwww.g2.com%2Fcategories%2Femail-anti-spam%2Ffree%3Fpage%3D3&secure%5Btoken%5D=8d372fa9c2d4eacd0e095f98a969db63e2531963d0a72e72530e5c71b327b4e7&secure%5Burl%5D=https%3A%2F%2Fipinfo.io%2Fproducts%3Futm_source%3Dg2%26utm_medium%3Dpaidreview%26utm_campaign%3Dg2_clicks&secure%5Burl_type%5D=custom_url) ### [MX Layer Email Security](https://www.g2.com/products/mx-layer-email-security/reviews) MX Layer is a leading enterprise security company based in the United States. Our focus is on providing cutting-edge cloud-based solutions for email security, business continuity, data loss prevention and email archiving services. At MX Layer, we ensure that our comprehensive email security platform protects your company's critical communications at all times. Our user-friendly web-based interface makes it easy to control inbound and outbound email traffic, protecting your employees and customers from ever-evolving threats such as spam, phishing, and malware. MX Layer offers best-in-class defense against phishing, impersonation, and many other threats, making it the ultimate email security solution for businesses of all sizes. - Email Security - Inbound Email Filtering - Outbound Email Filtering - Email Threat Protection - Anti-spam and Malware Protection - Email Gateway Protection **Average Rating:** 5.0/5.0 **Total Reviews:** 1 #### How Do G2 Users Rate MX Layer Email Security? - **Has the product been a good partner in doing business?:** 8.3/10 (Category avg: 9.2/10) - **Quality of Support:** 10.0/10 (Category avg: 9.0/10) - **Ease of Admin:** 6.7/10 (Category avg: 8.9/10) - **Ease of Use:** 10.0/10 (Category avg: 9.0/10) #### Who Is the Company Behind MX Layer Email Security? - **Seller:** [MX Layer](https://www.g2.com/sellers/mx-layer) - **Year Founded:** 2015 - **HQ Location:** Las Vegas, US - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=b110b35fb10328f3f6607b19d19d34dd99e14ee72082ea22367f8cc2ad11e5b9&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fmxlayer%2F&secure%5Burl_type%5D=linkedin_company_website) 4 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Medium #### What Are Recent G2 Reviews of MX Layer Email Security? **["Great product that just works as expected"](https://www.g2.com/survey_responses/mx-layer-email-security-review-7994986)** **Rating:** 5.0/5.0 stars _— Verified User in Telecommunications_ [Read full review](https://www.g2.com/survey_responses/mx-layer-email-security-review-7994986) ### [AegisAI Security](https://www.g2.com/products/aegisai-security/reviews) AegisAI is an API-based email security platform purpose-built for Microsoft 365 and Google Workspace. The platform utilizes autonomous AI agents to evaluate inbound mail across identity signals, sender behavior, and language intent. This multi-layered analysis enables the detection of highly sophisticated threats that often bypass traditional security gateways, specifically AI-powered spearphishing, compromised vendor accounts, and complex business email compromise (BEC). Rather than relying on static signatures, AegisAI analyzes user intent in every interaction. By understanding the unique communication patterns between specific senders and recipients, the platform identifies the subtle anomalies—such as shifts in urgency, tone, or phrasing—that signal a hijacked conversation or an impersonation attempt. Deployment is lightweight and non-disruptive, connecting directly via mail APIs without requiring MX record changes or altering mail flow. Beyond advanced social engineering, AegisAI provides comprehensive, native protection against phishing, malicious attachments, and zero-day malware. Its self-learning model also functions as an intelligent filter to neutralize persistent spam and promotional noise, ensuring a clean and secure inbox for both general users and high-target executives. This specialized filtering reduces the "alert fatigue" that often distracts SOC teams from high-priority security events. AegisAI leverages agentic investigation to secure every layer of the inbox, providing a robust defense against Account Takeover (ATO) attempts and Data Loss Prevention (DLP) risks. Unlike traditional tools that rely on basic reputation checks, AegisAI provides security teams with advanced AI forensics and actionable intelligence. Every detection—from a suspicious file to a subtle impersonation attempt—is supported by a clear evidence trail. This allows SOC teams to resolve the specific "blind spots" found in modern social engineering while maintaining total visibility into the evolving trust dynamics of their organization. By deploying a self-configuring control plane, AegisAI automates the remediation process, ensuring that once a threat is identified, it is neutralized across the entire enterprise instantly. #### Who Is the Company Behind AegisAI Security? - **Seller:** [AegisAI Security](https://www.g2.com/sellers/aegisai-security) - **HQ Location:** N/A - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=059214fefc7566cd53d26a8dcc4f07a5369b3f4881977116ee7ffc32134a4dfa&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Faegisaisecurity%2F&secure%5Burl_type%5D=linkedin_company_website) 1 employees on LinkedIn® ### [Bulletproof Inbox](https://www.g2.com/products/bulletproof-inbox/reviews) Bulletproof Inbox is a Gmail and Outlook email solution that optimizes your email experience by eliminating unwanted email. Our access control technology sits between your inbox and the sender, and allows only Approved Senders into your inbox. Unwanted emails are blocked, while new / unknown email is quarantined into an evaluating folder for later review. It's simple. There's no need for a new email, app or interface. Just manage your email as you normally would. #### Who Is the Company Behind Bulletproof Inbox? - **Seller:** [Bulletproof Inbox](https://www.g2.com/sellers/bulletproof-inbox) - **Year Founded:** 2021 - **HQ Location:** N/A - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=bc4e10cae9f5eeb3f4f0e5a1796fd77527523caffc8a20c3a00ff39b91c713a1&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fbulletproof-inbox%2Fabout%2F&secure%5Burl_type%5D=linkedin_company_website) 3 employees on LinkedIn® ### [Cloudphish](https://www.g2.com/products/cloudphish/reviews) Cloudphish is an anti-phishing software company based in Billerica, MA. Cloudphish is easy to install and protects your employees and customers from dangerous impersonation emails using the power of blockchain. Our software sends clear, visual feedback in the email header to alert users to any potential threats posed by an incoming message - in-context and in real-time. Cloudphish easily integrates with any existing email security software, working as the last line of defense to stop sophisticated phishing emails. Our plugin-based software works with Gmail and Outlook.com and all major browsers and devices. https://www.youtube.com/watch?v=8KWTQhpHdIw #### Who Is the Company Behind Cloudphish? - **Seller:** [Cloudphish](https://www.g2.com/sellers/cloudphish) - **Year Founded:** 2019 - **HQ Location:** Bedford, US - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=350e63e7cff52605eb2c80c739fc04efc7199a67805434878552132afd684e5e&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fcloudphish&secure%5Burl_type%5D=linkedin_company_website) 2 employees on LinkedIn® ### [FactorX: AI Powered Email Security for Modern Threats](https://www.g2.com/products/factorx-ai-powered-email-security-for-modern-threats/reviews) FactorX.ai is an AI-powered email security platform that protects enterprises from phishing, BEC, and malware using real-time threat detection, behavioral analysis, and automated incident response to stop advanced threats before damage is done. #### Who Is the Company Behind FactorX: AI Powered Email Security for Modern Threats? - **Seller:** [FactorX](https://www.g2.com/sellers/factorx) - **Year Founded:** 2024 - **HQ Location:** Newark, US - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=a0153005bde3cf6ccd8474fe407a9dd2816ded96eeafa3aad6a0516eac81a79a&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Ffactorxai&secure%5Burl_type%5D=linkedin_company_website) 1 employees on LinkedIn® ### [Maldun Email Security Solution](https://www.g2.com/products/maldun-email-security-solution/reviews) Maldun Email Security Gateway (ESG) is a multi-featured mail gateway deployed in front of the mail server(s) to provide inbound email security, and after the mail servers before Internet for the outbound email security as well as other functions. Maldun ESG is powered by the next generation email security infrastructure and has the capability to filter out all sorts of email threats like spam, virus, phishing/scam, marketing/graymail. and other unwanted email messages. With the additional Maldun Advanced Threat Protection (ATP) integration, Maldun ESG is able to detect and block unknown and advanced threats. Tier One: Connection Control and authentication Block email threats at the connection phase to prevent threats and increase efficiency: • Denial of Service (DoS) Protection • SMTP Rate Limit • Sender IP Reputation Analysis • SMTP Transaction Check • Sender authentication (SPF, DKIM, DMARC) • Mail server authentication (TLS) Tier Two: Adaptive Sender Reputation Filtering More than an IP blacklist: 
 • Sender Reputation System based on multiple factors: Sender domain, Connecting IP, From address, To address, Sender/Recipient relations • Intelligent and adaptive, it learns user behaviors and adjusts automatically • Optimized algorithm guarantees flexibility, accuracy, and efficiency Tier Three: Anti-Virus Filtering A combination of ClamAV and/or other anti-virus engines and Maldun attachment pre-detector: 
 • Anti-Virus engine offers an extensive real time scanning and virus definition updates. Catch a variety of known virus and phishing patterns, spyware, Trojans, worms and malware threats. • Maldun attachment pre-detector analyze abnormal attachment traffic and attachment file type to predict and block potential attachment threats 
 Tier Four: Anti-Spam Protection Anti-spam methods eliminate more than 99% of spam with a range of deep anti-spam technologies including: • Maldun heuristic Spam content rules • Maldun Spam machine learning signatures • Global Spam fingerprints database • Sender Domain/IP blacklists • URL blacklists • Other Spam signatures 
 Tier Five: Graymail Detection Flexible Graymail (Marketing/Advertisement) analysis with independent On/Off/Mark switch: 
 • Newsletter • Campaigns • Social network • Advertisements 
 Tier Six: Advanced Threat Protection To protect against the unknown, new advanced malware, Maldun ESG submits email attachment files and URLs to the Advanced Threat Protection appliance. Maldun APT will scan and block as follow: • File/URL(domain, IP) reputation query Global File/URL black/whitelist database for quick comparison and detection. • Dynamic Sandbox Scanning Suspicious email attachments will be sent as encrypted packages to the powerful APT appliance to run dynamic sandbox scanning. • Optional Threat Analysis Cloud Analysis Maldun ESG supports API submission of Email attachments and URLs to the Maldun Threat Analysis Cloud. • Threat Scores and Malware family Threat Level Analysis that commands Maldun ESG to either block or release certain mails. • Professional Analysis Report Analysis report includes malicious file meta data, static analysis, behavior analysis, network activities and registry summary, etc Tier Seven: Anomaly Detection Maldun Anomaly Detection module detects anomalies and abnormal behaviors of Email Sender and Email Recipients. With pre-defined anomaly rules, the admin will always be warned about the email aromalies that require attention. Together with the Sender Reputation and customized VIP mailbox rules, Maldun Anomaly Detection effectively detects BEC and other email frauds. Tier Eight: Content Filters The Content Filters allows organizations to compile customized content signatures to detect text patterns or image patterns in the email body and/or attachments, and set up email processing strategies against the content violations. The Content Filters module can effectively work as sensitive content detection, content violation detection, and data leak protection for companies and organization to comply with regulations and policies. #### Who Is the Company Behind Maldun Email Security Solution? - **Seller:** [Maldun Security](https://www.g2.com/sellers/maldun-security) - **Year Founded:** 2016 - **HQ Location:** Hong Kong, HK - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=32a8e96041f0f0752f2fb88595e8a665a36ce1b0953ffda20427c04197118a7e&secure%5Burl%5D=http%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fmaldun&secure%5Burl_type%5D=linkedin_company_website) 1 employees on LinkedIn® ### [Spameo](https://www.g2.com/products/spameo/reviews) Spameo is a spam blocker for Gmail. #### Who Is the Company Behind Spameo? - **Seller:** [Spameo](https://www.g2.com/sellers/spameo) - **HQ Location:** N/A - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=7886df2ed926834e5eb248c77dcfa8e5c815d3ab1f0fe3132ced0dba45868834&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2FNo-Linkedin-Presence-Added-Intentionally-By-DataOps&secure%5Burl_type%5D=linkedin_company_website) 1 employees on LinkedIn® - [‹ Prev‹ Prev](/categories/email-anti-spam/free?order=g2_score&page=2#product-list) - [1](/categories/email-anti-spam/free?order=g2_score#product-list) - [2](/categories/email-anti-spam/free?order=g2_score&page=2#product-list) - 3 - Next ›Next › Spotlight Categories [Social Media Listening Tools](https://www.g2.com/categories/social-media-listening-tools) [Demo Automation Software](https://www.g2.com/categories/demo-automation) [Password Managers Software](https://www.g2.com/categories/password-managers) [Travel Management Solutions](https://www.g2.com/categories/travel-management) [Zero Trust Networking Software](https://www.g2.com/categories/zero-trust-networking) Similar Categories - [Secure Email Gateway](/categories/secure-email-gateway) - [Cloud Email Security](/categories/cloud-email-security) - [Email Encryption](/categories/email-encryption) - [Intelligent Email Protection](/categories/intelligent-email-protection) [Browse Email Anti-spam Themes](/categories/email-anti-spam/themes)