DuoCircle
Email infrastructure for organizations the incumbents won't engage with
DuoCircle is an independent, self-funded email infrastructure company operating since 2014, serving more than 50,000 organizations. The company runs a portfolio of specialized email products across four functional areas: authentication (SPF management, DMARC reporting, mail flow monitoring, BIMI hosting), protection (phishing protection, spam filtering, visual mail verification, email security for HCL Notes/Domino), delivery (outbound SMTP, developer email API, inbox placement testing, cold email outreach), and routing (email forwarding, alumni forwarding, backup MX, tenant migration, message replay). The company was founded in 2014 when it acquired Dyn's email hosting customer book, and later acquired Maysoft's customer book along with the SpamSentinel and Verisend products. DuoCircle is remote-first with an engineering team distributed worldwide and headquarters in California.
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