Mailshell is the leading provider of Internet filtering engines and SDK for OEMs, including email reputation, anti-spam, anti-phishing, URL categorization and DNS security. The company is privately held, profitable and growing. The company's annual customer renewal rate has exceeded 90% every year since 2005. Via more than 30 Mailshell OEM partners, more than 6,000 companies and 15 million consumers worldwide rely on "Powered by Mailshell" reputation-based AI filters to block fraud, spam and phishing. Mailshell's software helps its OEM partners immediately generate new revenue, up-sell existing products to new customers and minimize associated engineering and support costs. Mailshell has OEM relationships with companies based on five continents, including RSA/EMC, Check Point, Akamai, AVG, Avast, Clearswift, Eset, Vircom, Netgear and others.
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The Mailshell annual revenue was $11 million in 2026.
Tonny Yu is the CEO of Mailshell.
5 people are employed at Mailshell.
Mailshell is based in San Francisco, California.