# Best Email Anti-spam Software - Page 6 *By [Lauren Worth](https://research.g2.com/insights/author/lauren-worth)* Email anti-spam technology is used to prevent malicious content from being delivered via email. These tools scan email messages, content, and attachments for potential threats and then filter or block suspicious messages from being delivered. Administrators can whitelist approved content or senders while also blacklisting or blocking communications from suspicious parties. Companies use email anti-spam tools to prevent their employees from being misled through phishing attacks or compromising local networks when downloading malware. They also prevent employees from delivering information to misidentified users, saving the business from potential breaches. All [secure email gateway software](https://www.g2.com/categories/secure-email-gateway) possesses anti-spam or email filtering capabilities, but those tools also have additional features for comprehensive spam filtering, email encryption, and information archiving. To qualify for inclusion in the Email Anti-Spam category, a product must: - Filter email content for malware or viruses - Identify mislabeled senders or potential phishing attempts - Provide blacklisting or blocking capabilities to restrict communication with suspicious parties ## Top Email Anti-spam Software at a Glance | # | Product | Rating | Best For | What Users Say | |---|---------|--------|----------|----------------| | 1 | [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews) | 4.6/5.0 (572 reviews) | Perimeter spam and phishing filtering with post-delivery remediation | "[Robust Email Security with Some Rule Management Hurdles](https://www.g2.com/survey_responses/proofpoint-core-email-protection-review-12792121)" | | 2 | [Check Point Email Security](https://www.g2.com/products/check-point-email-security/reviews) | 4.6/5.0 (464 reviews) | API-inline phishing prevention for Microsoft 365 | "[Accuracy Redefined, Perfect for Email Security](https://www.g2.com/survey_responses/check-point-email-security-review-12713186)" | | 3 | [Microsoft Defender for Office 365](https://www.g2.com/products/microsoft-microsoft-defender-for-office-365/reviews) | 4.5/5.0 (280 reviews) | Microsoft 365-native phishing and email threat defense | "[Built-In Defender Policies Strengthen Office 365 Security](https://www.g2.com/survey_responses/microsoft-defender-for-office-365-review-12958457)" | | 4 | [Abnormal AI](https://www.g2.com/products/abnormal-ai/reviews) | 4.8/5.0 (73 reviews) | API-native BEC and phishing auto-remediation | "[Flawless Protection with Insightful Reporting](https://www.g2.com/survey_responses/abnormal-ai-review-12811299)" | | 5 | [Paubox](https://www.g2.com/products/paubox/reviews) | 4.9/5.0 (574 reviews) | Frictionless inbound filtering with automatic outbound encryption | "[Smooth, Reliable HIPAA-Compliant Email Encryption with Minimal IT Effort](https://www.g2.com/survey_responses/paubox-review-12927601)" | | 6 | [Libraesva Email Security](https://www.g2.com/products/libraesva-email-security/reviews) | 4.8/5.0 (103 reviews) | Low-false-positive email threat filtering with M365 | "[Safety, ease of use, great team.](https://www.g2.com/survey_responses/libraesva-email-security-review-11231790)" | | 7 | [IRONSCALES](https://www.g2.com/products/ironscales/reviews) | 4.7/5.0 (63 reviews) | AI-automated phishing detection with inbox remediation | "[Centralized Email Security with Smart AI](https://www.g2.com/survey_responses/ironscales-review-12784875)" | | 8 | [Hornetsecurity 365 Total Protection](https://www.g2.com/products/hornetsecurity-365-total-protection/reviews) | 4.6/5.0 (65 reviews) | Microsoft 365-native email filtering with unified backup | "[Multi-Tenant Time Saver with Reliable Anti-Spam and Smooth Microsoft 365 Integration](https://www.g2.com/survey_responses/hornetsecurity-365-total-protection-review-12667340)" | | 9 | [Valimail](https://www.g2.com/products/valimail/reviews) | 4.5/5.0 (459 reviews) | Automated DMARC enforcement and spoofing prevention | "[Valimail Streamlines DMARC Management with Clear Dashboards and Smart Insights](https://www.g2.com/survey_responses/valimail-review-12713024)" | | 10 | [Barracuda Impersonation Protection](https://www.g2.com/products/barracuda-impersonation-protection/reviews) | 4.5/5.0 (87 reviews) | M365-native spear-phishing and impersonation remediation | "[Barracuda Impersonation Protection Feels Like a Force Field for Our Organization](https://www.g2.com/survey_responses/barracuda-impersonation-protection-review-12351300)" | --- ## What Are the Most Common Questions About Email Anti-spam Software? *AI-generated · Last updated: May 26, 2026* ### What Email Anti Spam platforms with the best track record on false-positive reduction in large organizations? Based on G2 reviews, buyers looking for false-positive reduction in larger environments most often describe a balance between strong filtering and fewer disruptions from Check Point Harmony Email & Collaboration, Abnormal AI, and Libraesva Email Security. According to verified users, Check Point is repeatedly praised for rarely blocking legitimate mail, while Abnormal AI reviewers say it reduces manual queue handling by accurately separating malicious and legitimate messages after a learning period. G2 reviewers mention Libraesva for low false-positive filtering and strong spam and phishing control, especially where administrators want clear visibility and easy tuning. Reviewers also note that some products still require policy adjustment, especially during early deployment or in more complex environments. **Here are some of the top-rated products on G2:** - [Check Point Harmony Email & Collaboration](https://www.g2.com/products/check-point-harmony-email-collaboration/reviews/check-point-harmony-email-collaboration-review-12713186) – reviewers say it rarely blocks legitimate mail while still catching phishing, spam, and malware. - [Abnormal AI](https://www.g2.com/products/abnormal-ai/reviews/abnormal-ai-review-12114161) – users highlight minimal false positives after the learning period across multiple tenants and platforms. - [Libraesva Email Security](https://www.g2.com/products/libraesva-email-security/reviews/libraesva-email-security-review-12693025) – reviewers emphasize low false positives alongside strong spam detection and reporting. ### Which Email Anti Spam solutions reduce IT admin workload while maintaining strict phishing protection? Based on G2 reviews, [Check Point Harmony Email & Collaboration](https://www.g2.com/products/check-point-harmony-email-collaboration/reviews/check-point-harmony-email-collaboration-review-12713186) stands out most clearly for reducing admin effort while keeping phishing defenses strong. According to verified users, teams describe simple setup, easy policy management, and less manual review because phishing, spam, fake links, and malicious attachments are filtered automatically. G2 reviewers mention that it helps reduce help desk tickets, saves IT time, and improves visibility without disrupting email flow. Reviewers do mention that initial policy tuning and alert noise can require attention in some environments, but the overall pattern in recent reviews is that administrators spend less time manually checking suspicious messages once the platform is in place. ### What Email filtering that blocks phishing attempts without trapping legitimate customer communication for mid-market companies balancing? Based on G2 reviews, products most often associated with strong phishing blocking and fewer interruptions to legitimate communication include Check Point Harmony Email & Collaboration, Proofpoint Core Email Protection, and Paubox. According to verified users, Check Point is frequently described as catching phishing and malware while rarely quarantining good mail compared with previous tools. G2 reviewers mention Proofpoint for strong threat detection, though some teams report occasional false positives that require manual release. Paubox reviewers highlight secure communication and phishing protection, but some users mention valid emails can be blocked in patient-heavy workflows. For mid-market buyers, the common theme in reviews is to prioritize products that combine strong filtering with clear quarantine controls and manageable policy tuning. ### What Email filtering tools ranked for reliable spam blocking when managing multi-tenant enterprise productivity suites 365 environments? Based on G2 reviews, the strongest options for reliable spam blocking in Microsoft 365-heavy and multi-tenant environments are Check Point Harmony Email & Collaboration, Hornetsecurity 365 Total Protection, and Microsoft Defender for Office 365. According to verified users, Check Point is praised for smooth API-based deployment with Microsoft 365 and for filtering phishing, spam, and malicious links without major mail-flow disruption. G2 reviewers mention Hornetsecurity for centralized multi-tenant policy control and dependable anti-spam filtering across tenants. Microsoft Defender for Office 365 is valued for native ecosystem integration, message tracing, and threat investigation within Microsoft environments. Reviewers across all three also note that tuning and navigation can take time, especially in more complex administrative setups. ### What highest rated Email Anti Spam platforms for healthcare practices requiring minimal false alarms based on user reviews? Based on G2 reviews, healthcare-focused buyers looking for minimal false alarms most often surface Paubox, Proofpoint Core Email Protection, and Libraesva Email Security. According to verified users, Paubox is widely used for HIPAA-focused communication and is valued for secure messaging that fits directly into existing inbox workflows, though some users note occasional valid emails landing in quarantine. G2 reviewers mention Proofpoint for strong protection against phishing, spoofing, and malicious attachments, but some organizations still report occasional legitimate messages being flagged. Libraesva reviewers repeatedly emphasize low false positives, easy administration, and strong protection against phishing and spam. Across these reviews, the best fit depends on whether the priority is healthcare compliance workflow, stronger enterprise controls, or minimizing mailbox disruptions. ### What Most trusted Email Anti Spam software by IT Security Managers at financial services firms based on user reviews? Based on G2 reviews, trusted options for teams handling sensitive financial-style risk patterns most often include Abnormal AI, Proofpoint Core Email Protection, and Check Point Harmony Email & Collaboration. According to verified users, Abnormal AI is praised for detecting sophisticated phishing, vendor fraud, account takeovers, and behavior-based attacks that traditional gateways missed. G2 reviewers mention Proofpoint for strong perimeter defense, attachment and link vetting, BEC detection, and detailed threat visibility. Check Point reviewers highlight phishing prevention, account takeover protection, and policy flexibility across cloud collaboration tools. While the review export does not consistently identify many financial services companies by segment, the trust signals that stand out most are reduced manual review, strong impersonation defense, and reliable handling of advanced phishing attempts. ### What Email Anti Spam platforms that reliably catch advanced phishing and ransomware threats without overwhelming admin queues? Based on G2 reviews, buyers looking for advanced threat coverage without heavy queue management most often compare Abnormal AI, Proofpoint Core Email Protection, and Sublime Email Security Platform. According to verified users, Abnormal AI is repeatedly described as highly accurate, with less time spent reviewing queues, fewer manual releases, and strong detection of phishing, vendor fraud, and account compromise. G2 reviewers mention Proofpoint for consistent blocking of phishing, malware, spoofing, and malicious attachments, although some teams report occasional quarantine tuning work. Sublime reviewers highlight transparent detections, automated remediation, and reduced manual investigation time for user-reported phishing. Across the reviews, the strongest signals come from products that combine accurate detections with automation and clear admin workflows. ### What best Email Anti Spam software for healthcare and finance teams managing HIPAA-compliant communication? Based on G2 reviews, healthcare and similarly regulated teams most often surface Paubox, Proofpoint Core Email Protection, and Heimdal when they need strong email protection with secure communication workflows. According to verified users, Paubox is especially associated with HIPAA-compliant email, encrypted communication, and an experience that does not require recipients to use extra portals or logins. G2 reviewers mention Proofpoint for blocking phishing, malware, spoofing, and suspicious attachments in security-sensitive environments. Heimdal reviewers describe bundled email and endpoint protection that helps isolate phishing and ransomware-targeted emails. Review patterns suggest Paubox is strongest for seamless compliant communication, while Proofpoint and Heimdal are more frequently praised for broader threat filtering and administrator controls. **Here are some of the top-rated products on G2:** - [Paubox](https://www.g2.com/products/paubox/reviews/paubox-review-12459860) – reviewers use it for HIPAA-compliant encrypted email that fits into existing inbox workflows. - [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews/proofpoint-core-email-protection-review-12429517) – users highlight phishing, malware, spoofing, and malicious link protection for sensitive organizations. - [Heimdal](https://www.g2.com/products/heimdal/reviews/heimdal-review-12683374) – reviewers describe isolating phishing and ransomware-targeted emails while bundling email and endpoint security. ### Which Email Anti Spam solutions offer granular policy controls for different departments and compliance zones? Based on G2 reviews, Check Point Harmony Email & Collaboration, Proofpoint Core Email Protection, and Libraesva Email Security are the products most often linked with granular controls. According to verified users, Check Point is praised for policy flexibility, DLP features, and visibility across email and collaboration tools, though some reviewers say advanced settings can be noisy or complex at first. G2 reviewers mention Proofpoint for customizable rules, internal DMARC policies, and protection layers that support large organizations with varied requirements, even if rule management can be spread across multiple areas. Libraesva reviewers highlight centralized administration, customizable rules, and detailed message analysis. The overall review pattern suggests these tools are strongest when buyers need tighter control across user groups, mail flows, and security policies. ### What Email filtering software that prevents legitimate emails from customer communication from being mistakenly blocked? Based on G2 reviews, buyers focused on preserving legitimate customer communication most often highlight Check Point Harmony Email & Collaboration, Abnormal AI, and Paubox. According to verified users, Check Point is frequently described as more accurate than previous solutions, with rare legitimate mail quarantines and fewer workflow disruptions. G2 reviewers mention Abnormal AI for accurately distinguishing genuine and malicious messages, reducing queue management and manual release work after deployment. Paubox reviewers value unobtrusive secure email workflows for client communication, though some users still report valid emails being blocked and needing unblocking options. Across reviews, the best pattern for avoiding mistaken blocks is strong phishing protection paired with low false-positive reports and easy quarantine review when edge cases appear. ## How Many Email Anti-spam Software Products Does G2 Track? **Total Products under this Category:** 120 ### Category Stats (Jun 2026) - **Average Rating**: 4.46/5 The average rating of products in this category, based on all submitted ratings - **Top Trending Product**: Heimdal (+1.48%) - Among all products in this category, Heimdal recorded the largest rating increase compared to last month *Last updated: June 10, 2026* ## How Does G2 Rank Email Anti-spam Software Products? **Why You Can Trust G2's Software Rankings:** - 30 Analysts and Data Experts - 5,300+ Authentic Reviews - 120+ 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. ## Which Email Anti-spam Software Is Best for Your Use Case? - **Leader:** [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews) - **Highest Performer:** [Libraesva Email Security](https://www.g2.com/products/libraesva-email-security/reviews) - **Easiest to Use:** [Libraesva Email Security](https://www.g2.com/products/libraesva-email-security/reviews) - **Top Trending:** [Sublime Email Security Platform](https://www.g2.com/products/sublime-email-security-platform/reviews) - **Best Free Software:** [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews) --- **Sponsored** ### IRONSCALES IRONSCALES is a cloud-native email security platform that helps enterprises and MSPs close gaps with mailbox-level detection, autonomous remediation, and built-in user training. It combines AI and human insights that continuously learn from user behavior, message context, and analyst feedback to identify advanced threats like BEC, account takeovers, impersonation, and other advanced phishing attacks. IRONSCALES is headquartered in Atlanta, Georgia and is proud to serve more than 17,000 customers globally. IRONSCALES leverages adaptive AI and its Agentic AI engine, Themis, to drive autonomous, mailbox-level remediation with customizable automation. Smart clustering, context-driven decisioning, and user-reported inputs enable Themis to remediate threats in real time while preserving analyst oversight and control. Designed for rapid deployment via API, IRONSCALES integrates with existing security stacks without requiring MX record changes. To reduce risk, improve SOC efficiency, and support a proactive security culture, its comprehensive capabilities also include: - Phishing Simulations - Security Awareness Training - DMARC management - Deepfake Live Protection - Generative AI tools [Visit website](https://www.g2.com/external_clickthroughs/record?secure%5Bad_program%5D=ppc&secure%5Bad_slot%5D=category_product_list&secure%5Bcategory_id%5D=1628&secure%5Bdisplayable_resource_id%5D=1628&secure%5Bdisplayable_resource_type%5D=Category&secure%5Bmedium%5D=sponsored&secure%5Bplacement_reason%5D=page_category&secure%5Bplacement_resource_ids%5D%5B%5D=1628&secure%5Bprioritized%5D=false&secure%5Bproduct_id%5D=127324&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&secure%5Btoken%5D=a82f3f989c53ddb4dd99be6f1dccb4fa98a61aea5e971f6f99d2247672286e75&secure%5Burl%5D=https%3A%2F%2Fsecure.ironscales.com%2Fdemo%3Futm_source%3Dg2%26utm_medium%3Daffiliate%26utm_campaign%3Dg2-ads&secure%5Burl_type%5D=book_demo) --- ## What Is Email Anti-spam Software? [Email Security Software](https://www.g2.com/categories/email-security) ## What Software Categories Are Similar to Email Anti-spam Software? - [Secure Email Gateway Software](https://www.g2.com/categories/secure-email-gateway) - [Cloud Email Security Solutions](https://www.g2.com/categories/cloud-email-security) - [Intelligent Email Protection Software](https://www.g2.com/categories/intelligent-email-protection)