Red Sift

Email authentication and brand protection that gets domains to DMARC enforcement without a DNS circus.

Proof of life. Won a 2025 Cybersecurity Excellence Award for OnDMARC, March 2025

Red Sift OnDMARC walks security and IT through SPF, DKIM, and DMARC until the domain is actually at reject, not monitoring. Adjacent products cover BIMI, certificate discovery, and lookalike domains that phishers register against the brand. It is the unglamorous layer under inbox security: if authentication is wrong, every other email product is guessing.

Category: Email and collaboration
Headquarters: London, United Kingdom
Country: United Kingdom
Founded: 2015
Funding stage: Series B
Total funding: $70M
Website: https://redsift.com