Security Startups

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

About Red Sift

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.

Work at Red Sift? Link to this listing

Optional badge for your site or README. It changes nothing about the listing, its order or its review. Other formats and a dark version: press kit.

<a href="https://securitystartups.com/companies/red-sift"><img src="https://securitystartups.com/badge/listed.svg" alt="Listed on Security Startups" width="184" height="44"></a>