Compare the Top Anti-Spam Software in the USA as of April 2026

What is Anti-Spam Software in the USA?

Anti-spam software is designed to detect, block, and filter out unwanted or malicious email messages, often referred to as spam, that can clutter inboxes and potentially contain harmful content such as malware or phishing attempts. This software uses various methods such as blacklists, whitelists, Bayesian filtering, and machine learning algorithms to identify and block spam emails before they reach the user's inbox. Anti-spam solutions are essential for businesses and individuals to protect sensitive information, reduce the risk of cyberattacks, and improve email productivity by eliminating irrelevant or harmful messages. Compare and read user reviews of the best Anti-Spam software in the USA currently available using the table below. This list is updated regularly.

  • 1
    SpamTitan

    SpamTitan

    TitanHQ

    SpamTitan email security is an email spam filter for businesses, smbs, MSPs, and schools. SpamTitan email security blocks spam as well as phishing and day-zero attacks, viruses, malware, ransomware, and other email threats. Helps control mail flow, clean it, and protect against unwanted email. We provide easy-to-use yet advanced email security for businesses, smbs and MSPs that are Office365 friendly. SpamTitan - Premium functionality included: • CEO Impersonation protection • Phishing/ Spear phishing protection • Link analysis • Full Sandboxing • Zero Day Attacks protection • Mail Spooling • Spoofing protection • Malware and Ransomware protection • SPF/DKIM/DMARC checking • Encryption • Fully multitenant environment • Ability to rebrand the entire UI • Full REST API: • Comprehensive support and set up docs Try a FREE, fully supported trial of SpamTitan Email Security today.
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    Starting Price: $2.14/user/month
  • 2
    N-able Mail Assure
    N-able Mail Assure cloud-based email security solution provides advanced threat protection for inbound and outbound email using collective threat intelligence, 24/7 email continuity, and long-term email archiving. The service includes a multitenant web-interface with predefined settings, reporting, and views designed to ensure control and visibility over email flows. N-able Mail Assure’s proprietary technology incorporates input from processing large volumes of email data that feeds the Intelligent Protection and Filtering Engine. This combined with real-time pattern threat recognition leveraging a variety of filtering technologies help protect against spam, viruses, phishing attacks, impersonation, spoofing, malware, and other email-borne threats.
  • 3
    Trustifi

    Trustifi

    Trustifi

    Trustifi offers industry-leading solutions for email security that helps small, mid-size, and enterprise organizations manage threat detection, regulatory compliance, data encryption & more. Easily deployed on: Outlook, Gmail, or any email server by relay **Advanced Threat Protection**: -Malware and ransomware virus detection, BEC attack prevention and alerts **Data Loss Prevention**: -100% compliant with HIPAA/HITECH, PII, GDPR, FSA, FINRA, LGPD, CCPA, and more **Encryption**: -NSA-grade. Select Enterprise customers have access to company branding and product white labeling. Plus one-on-one team training. Encryption needs aren’t one-size-fits-all, so your email security platform shouldn’t be either. Customized solutions are available upon request, often without charge.
  • 4
    Hornetsecurity Spam Filtering and Malware Protection
    Hornetsecurity’s Email Spam Filter and Malware Protection Service offers the highest detection rates on the market, with 99.9% guaranteed spam detection and 99.99% virus detection. Our Spam Filtering Service effectively protects mail servers against DDoS attacks and phishing emails. Our multi-layered spam filtering service blocks the majority of spam emails as they arrive—keeping the quarantine clear and easy to manage. With proven features and thorough spam filtering mechanisms, your inbox remains free of annoying spam emails. The abbreviation DDoS stands for Distributed Denial Of Service. A DDoS attack is a type of DoS attack in which multiple hijacked systems are used to overload system resources or network bandwidths. This makes websites and online services unreachable. For companies, this often means large financial losses due to delivery bottlenecks, for example, and major damage to their image from the perspective of customers.
  • 5
    MailCleaner

    MailCleaner

    MailCleaner

    MailCleaner is a business anti spam gateway installed between your mail infrastructure and the Internet. It offers professional protection against viruses and eliminates up to 99% of spam. While email is necessary for any corporate operations, it can also expose your company to a myriad of risks. This is because it offers virus, spyware, ransomware, cryptolocker, trojan and other harmful programs easy access to your business computers for phishing or extortion attack. This is where MailCleaner can help by stopping malware before it even reaches your employees’ inboxes. Its spam filter server ensures that more than 99% of unwanted messages are blocked, analyzing each message, so you only receive those that are important. If a harmful file is detected, MailCleaner will automatically send it to a quarantined zone where it cannot cause any more damage in the future. We are proud to offer a number of packages suitable for small companies as well as large corporations.
    Starting Price: $1 per month
  • 6
    SecurityGateway™ for Email Servers
    Developed by MDaemon Technologies, an email industry pioneer, Security Gateway's email threat detection technology has been protecting email servers from viruses, spam, phishing, data loss and other threats for over 20 years. Simply put, companies trust our expertise to help keep email communications safe. We protect all email platforms including Microsoft Exchange, Office 365 and others. Let our team of email security experts take the headache out of managing your company's email security needs. Security Gateway uses the latest email threat detection technology and policy enforcement tools to keep good emails flowing to and from your users. The Security Gateway cloud service can be deployed quickly and easily, allowing you to focus on other important tasks. Watch a short video to learn about some of the Security Gateway features.
    Starting Price: $1 per user per month
  • 7
    Symantec Email Security.cloud
    Safeguard Microsoft Office 365, Google G Suite, and on-premises email with the industry’s most complete email security solution. Insulate users from spear phishing, credential theft and ransomware attacks by using Email Threat Isolation. Prevent insidious email threats such as spear phishing, ransomware, business email compromise and email spam. Stop spear phishing emails with multiple layers of protection, threat isolation, spam filtering, advanced security email analytics, built-in user awareness, education tools, and more. Block the latest ransomware with content defense, sandboxing, and link protection technologies that detect emerging, stealthy, and zero-day attacks. Defeat business email compromise with impersonation protection, sender authentication enforcement and brand protection controls. Protect your brand reputation by using automation to solve the practical issues of enforcing sender authentication (DMARC, DKIM and SPF) with Symantec Email Fraud Protection.
  • 8
    Spambrella

    Spambrella

    Spambrella

    Dynamically classify imposter email. Preemptively identify and sandbox suspicious URLs. Leverage big-data analysis to accurately classify bulk mail. All within a single service that connects with Microsoft 365 and Google Workspace. Spambrella’s Email Security and User Awareness Training technology is used by some of the World’s largest and most successful security-conscious companies in a multitude of continents and environments. Delivered on a global scale, Spambrella is ready to unify your email security and user awareness training requirements. Think of us as your outsourced email security team! We have deep technical expertise of all other service providers such as MxLogic, Mimecast, Symantec.cloud and know how to migrate you effortlessly. Schedule a demo today with our cybersecurity experts to uncover email threats targeting your email users.
    Starting Price: $1.00
  • 9
    Xeams

    Xeams

    Synametrics Technologies

    Xeams is, a secure and powerful complete mail server for Windows, Linux, Solaris, MacOSX and other flavors of UNIX. Xeams supports SMTP, POP3, and IMAP. It features a powerful spam filtering engine that eliminates up to 99% of junk email upon installation. The software offers a flexible approach to email, making it a very user-friendly server. Xeams can block 99% percent of all junk messages right out of the box. The filtering rules are fully customizable and get better as Xeams adapts to your email environment. IMAP and POP3 servers built right into the system to easily fetch emails from an email repository to a client's machine. Xeams can be used as an email firewall in front of another server, such as MS Exchange, or as a full email server requiring no other software to process emails. Use Xeams in front of your Office 365 infrastructure to gain additional filtering, reporting and archiving capabilities that you don't get with Office 365 alone.
    Starting Price: $20.00/year/user
  • 10
    Barracuda Sentinel
    Business email compromise (BEC), spear phishing, and account takeover are rapidly becoming the most significant security threats facing organizations. These hyper-targeted attacks use socially engineered tactics designed to deceive employees and can be devastating to your business and brand. Barracuda Sentinel combines artificial intelligence, deep integration with Microsoft Office 365, and brand protection into a comprehensive cloud-based solution that guards against business email compromise, account takeover, spear-phishing and other cyber fraud. At the heart of Barracuda Sentinel is the AI engine that detects and blocks socially engineered attacks in real-time and identifies the employees who are at highest risk. Unique API-based architecture gives Sentinel’s AI engine access to historical email data to learn each user’s unique communications patterns. The engine leverages multiple classifiers to map the social networks of every individual inside the company.
  • 11
    SpamHero

    SpamHero

    iSparks

    Sender behaviors are tracked in real-time. The sender's reputation is weighed during the filtering process. Using spam traps around the world we are able to detect new spam attacks as they occur and adapt to them instantly. Never miss an important email. All spam is stored in a searchable quarantine. The process usually takes less than 5 minutes to get set up! In fact, you don’t even have to tell SpamHero what email addresses on your domain are valid. During your trial period, SpamHero will auto-learn what email addresses on your domain are valid. Unlike other spam filtering systems that rely on fancy algorithms that spammers can easily defeat, SpamHero's rule-based system features million of rules that are constantly updated and maintained by live superheroes and robots 24/7. Like other spam filtering solutions, we use popular virus scanners to help block viruses.
    Starting Price: $5 per month
  • 12
    Comodo Dome Antispam
    Secure Email Gateway is an enterprise anti-spam and threat prevention system that uses a sophisticated array of spam filters, anti-virus scanners and content analysis engines to prevent unsolicited mail from ever entering your network. Security needs differ from employee to employee. You may want to apply different security levels to different employees such as from finance or sales departments. Dome Anti-spam gives you the freedom to define different types of profiles with different security features and restrictions. Containment protects from the newest forms of ransomware, zero-malware, and other advanced threats. The Valkyrie file verdict system analyzes unknown files. Users are free to open, execute and use the attachments with ZERO risk of infection. Comodo's unique containment technology ensures that risks are fully contained before reaching the end point, so there is no risk of infection, even from the newest malware.
    Starting Price: $4.00/one-time/user
  • 13
    ZEROSPAM

    ZEROSPAM

    ZEROSPAM

    ZEROSPAM allows organizations of all sizes to defend against email ransomware, spearphishing, and other general threats. ZEROSPAM is a simple to use email security product that has a threat defense rate of 99.9% against threats via email. ZEROSPAM integrates with Office 365, and features a very low false positive rate.
  • 14
    modusCloud
    Vircom’s modusCloud is a cloud email security product providing real-time threat protection spam and phishing detection, advanced multi-layer anti-virus and email archiving. Users receive comprehensive protection against unwanted and malicious email. while administrators can easily tailor service to users’ needs and policies. modusCloud gives clients access to an enterprise security technology and infrastructure that is used by some of the world’s largest and most security conscious companies. We combine this with expert knowledge and understanding of the needs that smaller businesses have. Along with our email threat protection, we provide a hosted email security product with a robust filter-rules engine, email continuity with Emergency Inbox, policy-enforced encryption and a cloud-based email archive. All of which is managed in a simple and intuitive user interface.
  • 15
    SilverSky Email Protection Suite
    Email is the number one threat vector for cybersecurity attacks. Signature-based anti-virus and standard reputation-based anti-spam solutions are no longer sufficient to secure email against today’s sophisticated payloads and social engineering attacks. Protect yourself from ransomware, malware, phishing campaigns, and business email compromise. As compliance requirements become more stringent, you need email security best practices to protect both internal and customer data and maintain email archives. Do more with your cloud email and collaboration tools. For many companies, email, office productivity, and collaboration tools are purchased with office efficiency in mind but without much regard for security. SilverSky offers cloud email, office productivity, and collaboration tools with security layered into the bundle.
  • 16
    ContentCatcher

    ContentCatcher

    Clearnetwork

    Our system was built from the ground up to deal with today’s advanced threats. If your business has 5 employees or 10,000 employees, ContentCatcher is an ideal solution. Email is still the number one communication tool for business. When your email server or provider goes down for any period, it can cost you greatly. ContentCatcher provides you with a 24/7 emergency inbox that automatically turns on when you go down. Users access the emergency inbox in our online portal which features a full-fledged email client to send and receive email, enabling users to continue work with minimal disruption. Businesses of small or large are targeted by the same email threats. Bad actors often have no idea of the size or function of the businesses in the lists they are targeting. You need a comprehensive email security solution that protects your business. ContentCatcher offers packages that will fit your needs today and in the future.
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