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Open Source Anti-spam Software (2026)

Last updated: April 2026

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57 software options

Heimdal Email Security logo

Heimdal Email Security

Email Protection in a Redefined Spam Filter

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Heimdal Email Security is an email protection solution that combines advanced spam filtering with robust malware prevention through a multitude of modern technologies.

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ContentCatcher logo

ContentCatcher

Cloud-based email security, phishing protection & anti-spam

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ContentCatcher is a web-based SaaS solution offering email security, encryption, anti-spam, phishing protection and compliant archiving to assist organizations of all levels to combat and mitigate malicious email threats, with features including anti-virus, filtering, URL defense, reporting and more

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Netacea Bot Management logo

Netacea protects websites, mobile apps and APIs from bots.

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Netacea Bot Management is a cloud-based solution which protects mobile applications, websites & application programming interfaces (APIs) from various online threats such as scraping, credential stuffing, & more. An Intent Analytics engine uses machine learning to distinguish bots from humans.

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Sentry Email Defense Service logo

Cloud-based email protection platform

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Sentry Email Defense Service (EDS) is a cloud-based platform that helps businesses ensure protection against spam, virus, phishing links, DDoS, ransomware, and various other threats. Features include real-time reporting, encryption, data leakage protection, SMTP logs, and email archiving.

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CyberCAST logo

Going Beyond The Alert

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Zyston, a leading cybersecurity provider, offers CyberCast, a software solution which finds critical insights into an organization's threat susceptibility.

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Abnormal AI logo

A Fundamentally Different Approach to Email Security

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Abnormal provides total protection against the widest range of attacks including phishing, malware, ransomware, social engineering, executive impersonation, supply chain compromise, internal account compromise, spam, and graymail.

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condignum logo

Cloud-based compliance management solution

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condignum is a cloud-based compliance management solution designed to help businesses of all sizes and industries handle security requirements and risks. It allows administrators to automatically evaluate complex issues using knowledge databases within the platform.

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INLYSE Malware.AI logo

VISUAL AI BASED MALWARE DETECTION

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INLYSE Malware.AI is a revolutionary visual AI-based malware detection solution that utilizes cutting-edge technology to convert files into graphical representations and analyze them comprehensively for any signs of malware.

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Trustifi logo

Protect Your Business Emails with AI-Powered Security

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Email security solution that helps manage threat detection, regulatory compliance, data encryption, whitelisting/blacklisting, and more.

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Security Gateway by MDaemon logo

Powerful yet flexible email security software.

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Security Gateway by MDaemon is an email security software designed to help businesses secure email servers from malware and phishing attacks. The solution enables administrators to automatically detect threats across various platforms including Microsoft Exchange Server and Office 365.

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IPQS logo

Fraud prevention solution for proactively detecting fraud

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IPQS, an unparalleled fraud prevention solution powered by fresh data. Detect fraud in real-time, score mobile traffic, identify high-risk users, and block abusive behavior. Ensure lead quality with data verification. Choose IPQS for proactive fraud prevention and a frictionless user experience.

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Topsec Cloud Solutions logo

Your Managed Email Security Specialists

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Topsec Email Security is a complete email filtering solution that helps organizations to check all their incoming and outgoing email content for virus and spam.

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ESET Cloud Office Security logo

Security platform for Microsoft 365 applications

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ESET Cloud Office Security provides advanced protection for Microsoft 365 applications against malware, spam or phishing attacks with ultimate zero-day threat defense and an easy-to-use console.

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Avanan logo

Email Security — Reinvented

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Avanan catches the advanced attacks that evade default and advanced security tools. Its invisible, multi-layer security enables full-suite protection for cloud collaboration solutions such as Office 365, G-Suite, and Slack. The platform deploys in one click via API.

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ESET PROTECT MDR logo

Future ready protection for enterprise

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Airtight protection of your IT environment,
with complete cyber risk management and
world-class ESET expertise on call.

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ESET Home Office Security Pack logo

Cloud-based cybersecurity solution for SMBs

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ESET Home Office Security Pack is a comprehensive solution for small and medium-sized businesses and startups that need to protect digital equipment

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LeanMail logo

Don't give up finding a solution for email until you try LM

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Get Total Control Over Outlook. For every type of user and every personality type. Five easy, customizable solutions that give you all the control over your inbox that you want.

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ALTOSPAM logo

Effectively protect all your company's emails

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ALTOSPAM is an email protection solution for all businesses, associations and local authorities. Choose advanced email security compatible with all mail servers, including Office 365. Try ALTOSPAM for free.

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Zerospam logo

Cloud email security & anti-spam solution

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ZEROSPAM is a complete cloud email security and anti-spam solution that protects domains against spam, ransomware, spear phishing, viruses, phishing and all harmful emails. Detect disguised executable files & infected macros sent as attachments via emails or downloaded through a malicious link.

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IRONSCALES logo

We catch the phish that others miss!

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We ensure your inboxes are uncompromised and your team is unburdened.

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modusCloud logo

Cloud email security, encryption, and archiving

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modusCloud is a cloud email security solution with tools for spam detection, threat monitoring, email archiving, phishing detection, and more. The cloud-based platform offers features including filtering, continuity, encryption, and archiving in order to provide businesses with email protection.

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ESET Endpoint Security logo

Network security, network monitoring & endpoint protection

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ESET Endpoint Security is a network monitoring solution, which helps businesses manage processes for detecting threats, blocking targeted attacks, preventing data breaches & providing protection against ransomware. It lets users monitor behavior of malicious processes and decloak memory segments.

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Spam Filtering and Malware Protection logo

Spam filter service for email inboxes

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Hornetsecurity Spamfilter is a spam filter service designed to help enterprises detect & protect email mailboxes from spam, malware and viruses, with spam recognition & virus detection technology, plus adjustable content filters for unwanted attachments, statistics, encrypted data traffic, and more

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Radware Bot Manager logo

Automated bot detection for websites and mobile apps

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Radware Bot Manager is an automated bot detection solution that is suitable for websites and mobile applications. It is suitable for businesses in various industries, including e-commerce, financial services, travel, media, and others. With this solution, users gain granular visibility and detailed insights related to malicious bot traffic. Radware Bot Manager is designed to help businesses protect online assets, brand reputation, user experience, and revenue.

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MailCleaner logo

Cloud & on-premise anti spam software for businesses

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MailCleaner offer cloud or on-premise anti spam and anti virus protection for ISP SME SMI & large companies, non profit organizations and governments

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