Top 4 Email Anti-spam Software Companies With $1M–$5M Revenue (September 2026)

Sandyford, Dublin, Ireland

Topsec is a leading provider of cloud based managed email security solutions. Providing services to a large and diverse international client base for over a decade. At Topsec Cloud Solutions, we’ve been pioneering cloud-based email and web security for more than two decades. Our clientele spans across various sectors, including Government, Healthcare, Engineering, IT and more, each valuing our commitment to excellence and innovation. Our services include anti spam, anti virus, emergency email, email content filtering, image analysis, email archiving, inbox protection, breachdetect, file sharing and domain management. We help clients secure and manage their businesses information with no upfront investment. Through our services and experience, we save our clients thousands and Topsec is their trusted choice for delivering cloud based security solutions. Topsec is a division of Top Security Group. Top Security is an International company with over 34 years experience in physical security and entered the digital assets security industry with the launch of Topsec in 2002. We are proud to be the sole provider of a fully managed concierge service tailored to your email security needs. Our unmatched customer support is the cornerstone of our operations. We believe in putting you first, always. Our growth stems from leveraging cloud scalability to deliver superior security services, ensuring affordability and quality across diverse industries.

Gothenburg, Vastra Gotaland, Sweden

Provider of email security and infrastructure software designed to change the landscape of email security. The company's software offers great scalability, multiple rate limiting and total control on spams, enabling service providers to tailor their protected email infrastructure.

Carson City, Nevada, United States

CleanTalk is a SaaS spam protection service for Web sites. CleanTalk uses protection methods which are invisible for site visitors. Connecting to the service eliminates needs for CAPTCHA, questions and answers and other methods of protection, complicating the exchange of information on the site. Our solutions are reliable, easy and efficient. Algorithms CleanTalk evaluates visitor behavior on the site and parameters filled in forms, these multi-level checks allow CleanTalk achieve such high-performance protection against spam attacks. The module is completely invisible to the visitors and allows you to permanently abandon the ways of protection that impede the communication of visitors to the site (CAPTCHA, question-answer, etc.). CleanTalk allows you to automate protection against distributed from spam and registration spam bots. The team CleanTalk has been developing a cloud spam protection system for 5 years and has created a truly reliable anti-spam service designed for you to ensure your safety. CleanTalk has an extensive database of spam activity of IP addresses and emails. We understand that these IP addresses are used for other types of attacks, including for fraud in electronic commercial transactions. The use the database of CleanTalk will help you more accurately identify fraud risks and can be used by you as one of the factors, as a complement to the existing system for tracking fraudulent activity. Every day CleanTalk receives information about spam attacks from 40-60 thousands of IP addresses. The entire base of spam active IP is about 20 000 000 IP addresses. https://cleantalk.org/help/fraud-prevention

Bratislava, Bratislavsky, Slovakia

Verify Email Addresses * Email Deliverability * Email Marketing Since 2003, Email List Verify has provided businesses and marketers with the highest quality email list verification and cleaning services. We’ve developed an automated, self-service web application software which enables our clients to validate their email lists quickly and securely. Our service reducing bounce rates and improves email marketing campaign ROI’s for businesses and marketers by: » Cleaning email lists by detecting invalid or non-operational mailboxes. » Ensuring that no email on the list receives an unsolicited message during the validation process. » Handling data securely with the highest level of data encryption in the industry. What really makes us uniquely exceptional is the level of professionalism and sensitivity with which we handle clients’ lists. Security is something that we take very seriously and that is why big companies and corporations continually trust us with their data. We have always, and will continue giving you value for money spent.  ➨➨Visit EmailListVerify.com to ensure that your email list is of the highest quality ... upload and validate lists of email addresses quickly and securely to our web interface.