Best Anti-Spam Software in the USA
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Compare the Top Anti-Spam Software in the USA as of April 2026
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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.
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1
ZeroBounce
ZeroBounce
ZeroBounce is an email verification, scoring and deliverability platform helping businesses improve their inbox placement. The service detects email typos, nonexistent and abusive email accounts, spam traps and other risky email addresses. ZeroBounce also provides an email scoring service and a suite of deliverability tools to further enhance email inbox placement. The company operates a military-grade security infrastructure, ensuring customer data is protected at the highest levels. With more than 23 billion emails validated to date, ZeroBounce serves 400,000+ businesses in 190+ countries and adds up to 200 new clients every day. Companies using email lists validated by ZeroBounce report a 99%+ accuracy rate and maintain a good sending reputation. In 2019, ZeroBounce took no. 851 on the Inc. 5000 list of the fastest-growing private companies in the United States. In 2020, ZeroBounce rose to no. 40 on the list. In 2021, ZeroBounce was number 9 on the Inc. 5000 Regionals list.Starting Price: $18 - 2000 Validation Credits -
2
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.Starting Price: $2.14/user/month -
3
N-able Mail Assure
N-able
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. -
4
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. -
5
Checkpoint Anti-Spam and Email Security
Check Point Software Technologies
Check Point Anti-Spam & Email Security provides comprehensive protection for messaging infrastructure. A multidimensional approach protects email infrastructure, provides highly accurate anti-spam coverage and defends organizations from a wide variety of virus and malware threats delivered within email. Comprehensive email security with 97% spam detection. Advanced anti-spam protection, including content-based and via IP reputation. Offers antivirus protection with both zero-hour and signature-based detection. Email IPS protection against Denial of Service (DoS), buffer over-flow attacks. Simplified configuration and management of mail security. Simple configuration with low management-overhead. Full user control with no user installation required. Real-time detection and updates provide immediate protection from outbreaks. Integrated into the Check Point Infinity Architecture. Activate Anti-spam and email security on any check point security gateway. -
6
Hornetsecurity Spam Filtering and Malware Protection
Hornetsecurity
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. -
7
DataValidation
DataValidation
The most comprehensive email verification service in the email marketing industry! Our deliverability and compliance tools are used for managing email data, email list cleaning, and automating email validation. We perform extensive deliverability checks to analyze the health of an email address. One of our core beliefs is you should always know the quality of your email list(s) for free. View the health of your email lists in DataValidation’s self-service platform at any time. If your list needs maintenance, you can purchase and download the Address-by-Address Analysis. This analysis includes the following data for each email address: A+ to F grades, historical engagement, historical bounces, historical complainers, historical opt outs, history of spam traps, and history of deceased. We have 24/5 online support and you never have to worry about contracts, setup fees, or minimums. We work directly with ESPs so your data is safe with us. It’s free to get started. Upload a list tStarting Price: $3.50/one-time -
8
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 -
9
SecurityGateway™ for Email Servers
MDaemon Technologies
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 -
10
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 -
11
ALTOSPAM
OKTEY
This antispam and antivirus software is an online filtering bridge that quickly free you from the waste of time and expenses generated by the flooding of undesirable e-mails. ALTOSPAM is an integrated SaaS software protecting your email from spams, viruses, scams and phishing. It allows companies owning at least one domain name to secure its email servers. ALTOSPAM combines 16 anti-spams technologies, 6 anti-viruses as well as other security services such as anti-relay, anti-scam, anti-phishing and protection against denial-of-service attacks. In addition, this externalized antispam and antivirus software ensures a very high availability of you email services. Altospam is a full-service corporate email protection, integrating multiple security levels for your emails. ALTOSPAM not only blocks most unwanted emails, but mostly its antispam software has been designed to minimize false positives.Starting Price: $7 per user per month -
12
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 -
13
IRONSCALES
IRONSCALES
IRONSCALES Fights Phishing For You Our self-learning, AI-driven email security platform continuously detects and remediates advanced threats like BEC, credential harvesting, account takeover and more in your company’s mailboxes. FAST! Not All Email Security Solutions are Equal Defending against today’s advanced threats requires a new approach to email security. IRONSCALES’ best-in-class email security platform is powered by AI, enhanced by thousands of customer security teams and is built to detect and remove threats in the inbox. We offer a service that is fast to deploy, easy to operate and is unparalleled in the ability to stop all types of email threats, including advanced attacks like BEC, ATO and more.Starting Price: $4.50 per user per month -
14
PhishProtection
DuoCircle
Make your smartest investment to reduce email security threats today, and get a comprehensive email security protection solution with small business pricing. Cybercriminals are targeting CEOs, CFOs, HR, Accounting Departments and regular employees across every industry. As you know Office 365 is extremely limited in the protection that you can configure to stop impersonations, email fraud and phishing. There are only so many custom transport rules you can build to constantly block domains or protect against employee impersonations. PhishProtection works on every email server, device or smtp service. No matter if you are on your phone, or outlook or any email client anywhere, we can protect you. It offers best-in-class security to iOS and Android devices alike.Starting Price: $100/month/user -
15
Fingerprint
Fingerprint
Stop fraud, spam, and account takeovers with 99.5% accurate browser fingerprinting as a service. Access suspicious visitor activity and geolocation at lightspeed. Integrate our API into your server-side business rules or signup process. Receive instant notifications delivered securely to your backend systems, ideal for building scalable and asynchronous processes. Powerful account takeover protection for any web application. Keep your customers' accounts safe by accurately identifying threats before they cause damage. Users that re-use passwords across multiple services are at risk of having their accounts accessed by fraudsters who purchased or hacked their account information from elsewhere. Catch these attempts by associating multiple login attempts from bot networks. Social engineering is still one of the most reliable methods for fraudsters to access accounts. Require new visitors to provide additional authentication to stop phished accounts from being accessed easily.Starting Price: $80 per month -
16
Raptor Email Security
Peregrine Computer Consultants Corporation
Raptor Email Security is an MX-based email security solution designed by industry experts to stop spam, phishing, and malware attacks using a unique scoring framework and multiple technologies including SpamAssassin, ClamAV, MIMEDefang, and Sendmail. Let our experts handle the annoying spam for you! No Spam. Zero Tickets. 2X Resources. With your email going through our servers, we handle the brunt of most cyber attacks which keeps your server better protected! With less resource usage, you'll be able to increase your hosting revenue and monetize your server by adding more hosting accounts. Raptor Email Security also comes with Raptor Review which provides a detailed, expert analysis of your email configuration. It's a phishing hotline and white glove service to definitively fix your email problems including blocking spam, improving email deliverability, identifying scams, finding missing email, and unblocking good email. Set up in minutes. Free 30 Day Trial Available!Starting Price: $15/server/month -
17
Bot Butcher
Bot Butcher
Bot Butcher is an API designed to help developers stop contact form spam bots on websites by automatically classifying incoming messages using artificial intelligence. When a visitor or automated system submits a message through a website’s contact form, the message can be sent to the Bot Butcher API along with contextual information such as the domain. It uses a fine-tuned large language model to analyze the content and determine whether the message is spam or legitimate within the context of the website’s topic. The API then returns a JSON response indicating the classification, allowing developers to automatically block spam or pass valid messages to the intended recipient or CRM system. This enables websites to filter unwanted bot traffic before it reaches inboxes, significantly reducing the amount of spam that site owners must handle.Starting Price: $1.99 per month -
18
SpamBully
SpamBully
Intelligently knows which emails you've received are good and which are spam by using artificial intelligence and server blacklists. Everytime you download your email, SpamBully will make sure good emails make it to your Inbox. Decide who and what makes it into your Inbox. Choose which email addresses, words & phrases, countries, languages, and IP's are allowed or blocked from your Inbox. SpamBully always makes sure people in your address book make it to your Inbox. Get back at spammers by increasing their costs, returning their spam, and reporting them to the servers they came from and the FTC. Email a special password to an unfamiliar sender that they must correctly type in before their email is allowed to your Inbox. Checks Realtime Blackhole Lists for internet domains that are responsible for sending massive amounts of spam and automatically filters them from your Inbox.Starting Price: $29.95 per year -
19
Barracuda Sentinel
Barracuda
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. -
20
Intrusta
iSubscribed
We believe digital security should be easy for you. Click, surf, and browse worry-free because we are there to protect you. We are your partner, working to identify, analyze and prevent so you can go about your day as planned. Intrusta’s goal is to make online security simple. Whether it’s using our software, paying your bill, or chatting with a customer service agent, we’ve taken great efforts to make every interaction enjoyable and easy. Gone are the days of shocking price increases and unclear billing practices. We will be upfront about what you pay and when. Come renewal time, you shouldn’t be surprised. We’re perpetual learners with a knack for improvement, and we use our knowledge to ensure our product keeps up with evolving threats as you move through life. We pride ourselves on stellar support. We’re empathetic, reliable and ready to help. Whether it’s technical, product or payment related, you can trust us to find a speedy solution.Starting Price: $24.99 one-time payment -
21
Libraesva Email Security
Libraesva
Protect your business from disruption, financial loss and reputational damage. Libraesva Email Security stops known and emerging email threats from reaching their target, so you only receive legitimate messages. It provides exceptional email security by integrating cloud email and a secure email gateway with Libraesva’s unique Adaptive Trust Engine that uses AI to learn the usual patterns of behavior for organizations and individuals, continuously assessing the strength of business-to-business trust and proactively holding anomalous traffic. Libraesva Email Security scans and filters all inbound and outbound emails for advanced malware, phishing, business email compromise, spam and more. Proprietary sandboxing technology removes dangerous payloads and active content from attachments, and you can protect users from visiting unsafe sites with active URL analysis that checks every link. -
22
FortiGuard Antispam
Fortinet
A highly effective antispam is key to protecting your organization because email is the #1 vector for the start of an advanced attack on an organization. FortiGuard Antispam provides a comprehensive and multi-layered approach to detecting and filtering spam processed by organizations. Dual-pass detection technology can dramatically reduce spam volume at the perimeter, giving you unmatched control of email attacks and infections. Additionally, FortiClient endpoint agents can block spam messages on remote computers and mobile devices. In the 2015 VBSPAM Test from Virus Bulletin, Fortinet’s antispam ranked second highest in the security industry for security effectiveness, earning a 99.98% effectiveness rating. Protects your organization against threats delivered through email with highly effective antispam protection. Customize your policies to fit your organization with antispam filtering at a domain, group, or individual user level. -
23
Vade
Vade Secure
Vade is a global leader in predictive email defense, protecting 1 billion mailboxes in 76 countries. We help MSPs and SMBs protect their Microsoft 365 users from advanced email security threats, including phishing, spear phishing, and malware. ISPs, MSPs, and SMBs choose Vade's email security solutions to protect their users and their businesses from advanced cybersecurity threats, including phishing, spear phishing, and malware. Whether we’re protecting consumers through leading ISPs, or business through our MSP partners, our AI-based email security solutions are designed to detect the undetectable. Block dynamic phishing attacks that bypass traditional solutions. Block targeted spear phishing & business email compromise attacks. Block evasive polymorphic and zero-day malware attacks. -
24
MailChannels
MailChannels
Secure and deliver email at scale. Use MailChannels to uncover bad actors and prevent spammers from taking advantage of your infrastructure. Monitor outgoing email messages for spam and unusual sending activity. Protect your customer inboxes against spam, phishing, and other email threats. A powerful, intuitive interface makes managing your customers simple and efficient. We operate across multiple clouds and minimize single points of failure to keep our services online, all the time. Get a real human response to your ticket within 30 minutes or less, 24/7/365. MailChannels Outbound Filtering is a cloud-based SMTP relay service which identifies and blocks spammers to ensure reliable email delivery. With Outbound Filtering, you can eliminate email delivery problems caused by IP address blocklisting. Automatically shut down compromised accounts and scripts to improve your security.Starting Price: $79.99 per month -
25
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. -
26
modusCloud
Vircom
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. -
27
Introviz
Introviz
Introviz delivers powerful, patented technology to thwart the growing threat of cybersecurity to the corporate network. The battle of IT security originated, more than several decades ago, at the network entry points – routers, switches, firewall etc. Most companies have smart network engineers combating the hackers and have some consolation that they are attending to this problem – A false sense of security! The Cybersecurity battle has in the last several years has migrated to the “back door entry point” – employees’ browsers! Your employees surf on work, home, and public networks, and will inadvertently bring outside trackers and targeted zero-day malware into your network. Anti-Virus, VPN, Firewalls and Phishing Site protection protects against known phishing sites and viruses – not browser content. The browser has become the new gateway to phishing and malware. And the malware can spread from employee device to your network. -
28
SilverSky Email Protection Suite
SilverSky
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. -
29
DuoCircle
DuoCircle
Reliable and secure email hosting services for SMB and Enterprise. Safely processing over 100 million emails per month for our customers. Enhanced gateway security and filtering, inbound email security, email service backup and outbound SMTP using a new high quality infrastructure for top quality results that our customers deserve. Products include, Secure email gateway, email backup MX, email forwarding, outbound SMTP and more. DuoCircle protects against phishing attack with Link Click Protection, a part of the Advanced Threat Defense Suite. You’re covered with Link Click Protection even if site content changes between clicks. You get total protection from phishing and your confidential corporate information is secured because your employees are simply prevented from visiting sites that misuse such information. You get instant feedback in the form of an alert when a suspicious link is about to be visited. -
30
Mailprotector
Mailprotector
Mailprotector delivers award-winning email experiences exclusively through our amazing partner resellers. Easy to use encrypted email with no plugins or apps. Bracket has turned using email encryption from dread to delight. Just wrap brackets around the [subject] in any email client on any device, and Bracket handles the rest. Total email security that filters all the junk people don’t want. CloudFilter delivers full-stack protection from annoying spam and crippling email-based virus and phishing attacks in a way that’s effective, efficient, and easy to use. Prevents spam proliferation and keeps damaging or sensitive data from being leaked via email. SafeSend expands beyond CloudFilter’s outbound filtering by giving greater control over outbound email traffic with custom content rules and more.
