Best Email Anti-spam Software - Page 8

How Many Email Anti-spam Software Products Does G2 Track?

Total Products under this Category: 144

Category Stats (Nov 2026)

  • Average Rating: 4.46/5 The average rating of products in this category, based on all submitted ratings
  • Top Trending Product: Darktrace / EMAIL (+0.63%) - Among all products in this category, Darktrace / EMAIL recorded the largest rating increase compared to last month

Last updated: November 01, 2026

How Does G2 Rank Email Anti-spam Software Products?

Why You Can Trust G2's Software Rankings:

  • 30 Analysts and Data Experts
  • 6,400+ Authentic Reviews
  • 144+ 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

Highlighted products: Proofpoint Core Email Protection, Check Point Email Security, Valimail, Abnormal AI, Paubox, Microsoft Defender for Office 365, SaneBox, and LibraCyber 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=valimail&focus%5B%5D=abnormal-ai&focus%5B%5D=paubox&focus%5B%5D=microsoft-microsoft-defender-for-office-365&focus%5B%5D=sanebox&focus%5B%5D=libracyber-email-security)

inumbo

inumbo is a cloud-based anti-spam service that works with any e-mail infrastructure.

Who Is the Company Behind inumbo?

Janusmail

Every day Mailboxes and servers are subjects to phishing, spam, ransomware, viruses and malware attacks. JANUSMAIL is a new concept product, the result of 20 years of experience in the electronic mail management, created for: - Protect emails and servers from attacks and spam - Identify and resolve forwarding/receiving problems - Manage massive amunts of emails without slowdowns - Integrate seamlessly with Zimbra servers - In-depth analysis of incoming and outgoing emails - Include specific features for service providers

Who Is the Company Behind Janusmail?

LeanMail

Who Is the Company Behind LeanMail?

  • Seller: LeanMail
  • Year Founded: 2007
  • HQ Location: Barcelona , ES
  • LinkedIn® Page: www.linkedin.com
    3 employees on LinkedIn®

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How it works

MailChannels Outbound Filtering

Inbound and outbound email security solutions for internet infrastructure providers.

Average Rating: 3.3/5.0

Total Reviews: 2

How Do G2 Users Rate MailChannels Outbound Filtering?

  • Has the product been a good partner in doing business?: 5.0/10 (Category avg: 9.1/10)
  • Quality of Support: 8.3/10 (Category avg: 9.0/10)
  • Ease of Admin: 8.3/10 (Category avg: 8.9/10)
  • Ease of Use: 7.5/10 (Category avg: 9.0/10)

Who Is the Company Behind MailChannels Outbound Filtering?

  • Seller: MailChannels
  • Year Founded: 2004
  • HQ Location: Vancouver, CA
  • LinkedIn® Page: www.linkedin.com
    22 employees on LinkedIn®
  • Ownership: Privately-held

Who Uses This Product?

  • Company Size: 50% Medium, 50% Small

What Are Recent G2 Reviews of MailChannels Outbound Filtering?

Mailhardener

Mailhardener helps you to secure your domain against being used for email fraud and spam.

Who Is the Company Behind Mailhardener?

Maldun Email Security Solution

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?

MIMEDefang

MIMEDefang is an e-mail filtering tool that works with the Sendmail "Milter" library. MIMEDefang lets you express your filtering policies in Perl rather than C, making it quick and easy to filter or manipulate your mail. MIMEDefang is mature software: The first version was released in 2000. It's also in use in thousands of installations. It remains under active development. MIMEDefang is free software: It's released under the terms of the GNU General Public License. It runs under Linux, FreeBSD, Solaris and most other UNIX or UNIX-like systems.

Who Is the Company Behind MIMEDefang?

N-able Spam Experts

N-able SpamExperts helps web-hosting companies and ISPs/telcos strengthen email protection. Services include affordable inbound and outbound email filtering and archiving solutions—driven by a continuously updated Intelligent Protection & Filtering Engine to meet emerging threats.

Who Is the Company Behind N-able Spam Experts?

  • Seller: N-able
  • HQ Location: Morrisville, North Carolina
  • LinkedIn® Page: www.linkedin.com
    2,307 employees on LinkedIn®
  • Ownership: NYSE: NABL

Netacea Bot & Agent Trust Managament

Netacea is Bot and Agent Trust Management for commerce and content. We help enterprises tell the difference between good bots, bad bots, and AI agents, and turn that into protected revenue instead of a security headache. Under the hood, it's a server-side, AI-driven platform that reassesses every request in real time. Our unique agentless approach means no manual rule-writing, no code deploys, and one of the lowest false-positive rates in the category. That translates to fewer blocked customers, less firefighting, and a single view across your whole estate instead of stitched-together point tools. Working with us isn’t just about our patented technology. Behind the platform sit two dedicated human teams that understand the threats you face better than anyone else. Threat researchers who infiltrate the forums where attacks are actually planned, and consultants who tune the system and interpret results with you. So you get industrial-strength detection, with the human judgement to act on what matters. We're not guessing at this: we created the BLADE framework, now adopted by OWASP as the industry standard for business logic abuse — so when you work with us, you're working with the team that shapes how the sector defends against the threats you face.

Average Rating: 4.6/5.0

Total Reviews: 23

How Do G2 Users Rate Netacea Bot & Agent Trust Managament?

  • Has the product been a good partner in doing business?: 9.8/10 (Category avg: 9.1/10)
  • Quality of Support: 9.6/10 (Category avg: 9.0/10)
  • Ease of Admin: 8.8/10 (Category avg: 8.9/10)
  • Ease of Use: 8.8/10 (Category avg: 9.0/10)

Who Is the Company Behind Netacea Bot & Agent Trust Managament?

  • Seller: Netacea
  • Year Founded: 2018
  • HQ Location: Manchester, England
  • LinkedIn® Page: www.linkedin.com
    41 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Retail
  • Company Size: 52% Medium, 43% Large

What Do G2 Reviewers Say About Netacea Bot & Agent Trust Managament?

AI-generated summary from verified user reviews

Pros
  • Users commend Netacea for their exceptional customer support, providing timely and effective assistance during bot management challenges.
  • Users commend Netacea for their exceptional customer service, ensuring effective bot management and quick resolution of issues.
  • Users commend Netacea for its effective bot protection and outstanding customer support during transitions and issue resolutions.
  • Users commend the implementation ease of Netacea, crediting their responsive support for seamless integration and quick deployment.
  • Users highlight the effective bot protection of Netacea, ensuring legitimate traffic and excellent customer service support.
Cons
  • Users feel the management console lacks limited customization options, impacting their overall satisfaction with the product.
  • Users note a lack of features in the management console, though they remain generally satisfied with the product.

What Are Recent G2 Reviews of Netacea Bot & Agent Trust Managament?

What Are G2 Users Discussing About Netacea Bot & Agent Trust Managament?

OOPSpam

OOPSpam API stops bots and manual spam from reaching your customers with high accuracy and privacy.

Who Is the Company Behind OOPSpam?

  • Seller: Oopspam
  • Year Founded: 2019
  • HQ Location: Minneapolis, US
  • LinkedIn® Page: www.linkedin.com
    2 employees on LinkedIn®

outreachbin

OutReachBin lets you send unlimited mass emails that land in inbox! Get more opens, more leads, and more sales. Increase sender reputation and deliverability. Automations and sequences. Never miss a follow-up. Email personalization. Raise sender reputation.

Average Rating: 3.9/5.0

Total Reviews: 18

How Do G2 Users Rate outreachbin?

  • Has the product been a good partner in doing business?: 8.8/10 (Category avg: 9.1/10)
  • Quality of Support: 8.3/10 (Category avg: 9.0/10)
  • Ease of Admin: 9.3/10 (Category avg: 8.9/10)
  • Ease of Use: 8.6/10 (Category avg: 9.0/10)

Who Is the Company Behind outreachbin?

Who Uses This Product?

  • Top Industries: Marketing and Advertising
  • Company Size: 95% Small

What Are Recent G2 Reviews of outreachbin?

What Are G2 Users Discussing About outreachbin?

Parla

Parla is a corporate email solution in the cloud, with an integrated security layer and EU-compliant privacy controls.

Who Is the Company Behind Parla?

  • Seller: Spamina
  • Year Founded: 2007
  • HQ Location: Hannover, Lower Saxony, Germany
  • LinkedIn® Page: www.linkedin.com
    436 employees on LinkedIn®

PhishCloud Protection Platform for Business

PhishCloud Protection Platform for Business is the standard for phishing protection across all digital platforms. Our patented technology empowers people to spot phishing attacks in real-time, making it as simple as a traffic light - red for malicious, yellow for suspicious, green for safe - so that they make the right decisions, reducing risk across email, web, social media and messaging applications.​ PhishCloud fortifies IT with full visibility into the malicious content their users are seeing so that they can focus on the real threats, with real-time attribution and contextual event data. Automatically block bad links from being clicked, notify users in real-time so they are immediately aware of threats, and deliver reality-based training as it happens.

Who Is the Company Behind PhishCloud Protection Platform for Business?

Phish Report

Phish Report lets you quickly report any phishing site with an interactive guide. The abuse contact database means you're always reporting to the right place.

Average Rating: 4.0/5.0

Total Reviews: 1

How Do G2 Users Rate Phish Report?

  • Quality of Support: 6.7/10 (Category avg: 9.0/10)
  • Ease of Use: 6.7/10 (Category avg: 9.0/10)

Who Is the Company Behind Phish Report?

Who Uses This Product?

  • Company Size: 100% Large

What Do G2 Reviewers Say About Phish Report?

AI-generated summary from verified user reviews

Pros
  • Users value the automation in Phish Report, as it ensures safety without disrupting daily activities.
  • Users value the ease of use of Phish Report, appreciating its automation that ensures seamless daily operations.
  • Users find the automated processes for email security crucial for protecting company data and enhancing employee safety.
Cons
  • Users find integration issues frustrating, as only IT can manage updates, limiting overall effectiveness and usage.
  • Users find Phish Report not user-friendly, relying heavily on IT for integration and updates, limiting its effectiveness.

What Are Recent G2 Reviews of Phish Report?

Lauren Worth
LW
Researched and written by Lauren Worth
Updated October 3, 2024