CSA STAR Registry

DuoCircle: Enterprise Email Security Solutions Founded in 2014 in San Diego, California, DuoCircle specializes in enterprise email security. Originally focused on providing small businesses with enterprise-grade email services, the company now serves organizations ranging from SMBs to Fortune 50 enterprises and educational institutions. DuoCircle offers modular email security services including spam filtering, phishing protection, email forwarding, backup MX, outbound SMTP, transactional email APIs, SPF management, DKIM signing, and DMARC reporting. Customers can purchase individual services rather than predetermined bundles. Operating as a remote-first company with team members across multiple countries, DuoCircle provides 24/7 support to over 25,000 businesses worldwide. The company undergoes annual SOC 2 Type 2 examinations covering Security, Availability, Confidentiality, and Processing Integrity. DuoCircle serves diverse industries including Financial Services, Higher Education, Manufacturing, Healthcare, Retail, and Government agencies, positioning itself as a trusted partner for organizations seeking robust email security and reliable message delivery.