Sublime Security

Sublime Security is a next-generation email security platform founded in 2019 by Joshua Kamdjou and Ian Thiel. Based in Washington, DC, the company has raised over $20 million in venture capital, including a Series A led by Index Ventures in 2024. Sublime has positioned itself as the leader in transparent, Detection-as-Code email security, fundamentally departing from traditional black-box security solutions. The company publicly launched in 2023 and has prevented millions of email-borne attacks for customers and the broader community, from BEC and fraud to malware like Qakbot to callback phishing and QR code attacks.