Red Sift

Red Sift is a London-founded (2015) email security and brand protection company that has grown from a single DMARC-automation product into a five-pillar platform: OnDMARC/OnINBOX for email authentication and anti-phishing defense, Brand Trust for lookalike-domain detection, Certificates for TLS certificate discovery and monitoring, an attack surface management module, and Radar, an AI-assisted investigation and remediation layer. The company opened a US headquarters in Austin, Texas following a $54 million Series B round led by Highland Europe, bringing total disclosed funding to roughly $69.8 million.

Red Sift’s customer list is unusually well-documented for a company this size: publicly named references include Save the Children (DMARC deployment across infrastructure in 115 countries), Bitcoin.com (reporting protection of 2.3 million emails from phishing), ZoomInfo (reaching DMARC enforcement in 16 weeks), TalkTalk (protecting 4.2 million customers), Wise, and law firms William Fry and Bird & Bird, among others. That volume of named, checkable case studies is a meaningful signal in a category where many vendors rely on anonymized statistics.

DMARC and BIMI adoption has accelerated as Google and Yahoo enforce bulk-sender authentication requirements, making email authentication automation a genuine, timely need rather than a nice-to-have. Red Sift’s expansion into attack surface management and AI-assisted remediation is a reasonable extension of its email-security beachhead, though it now competes both against dedicated DMARC specialists and against broader ASM and email security platforms as it stretches across categories.