Abnormal AI
San Francisco, United States
API-native email and SaaS defense that baselines human behavior to catch BEC and account takeover.
Raised $250M Series D at a $5.1B valuation, August 2024
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Best Email and collaboration companies
Email security, browser isolation, and collaboration-security startups built after the last generation of secure email gateways.
Catalog last reviewed 2026-08-23. Page copy reviewed 2026-08-10. Next editorial review by 2026-09-10. Alphabetical order, no paid placement. 10 matched live listings.
This shortlist is the live catalog slice for the Email and collaboration category. Listings appear here only when their primary category matches. Full page-unique intros for remaining categories ship in a later polish pass.
How order works. Matched companies are the full live catalog slice for this primary category, sorted alphabetically by name. This is not a scored quality ranking. When listing fees open, they are intended to affect publish timing or review-queue position only, not alphabetical order or praise on this page (payments are currently closed). Aevral is a disclosed house listing under the same rules (coming soon, no pin). See /transparency.
Category index: /categories/email-collaboration. Parent hub: /best. Full catalog: /directory.
AppOmni
San Mateo, United States
SaaS security posture for Salesforce, ServiceNow, Microsoft 365, and the agents now living inside them.
Reported 43% year-over-year revenue growth and five of the top 10 Fortune 500 as customers, February 2025
DoControl
New York, United States
SaaS data security that watches sharing in Google Workspace, Slack, and Box, then revokes it automatically.
Launched Dot, an AI SaaS data security assistant, June 2025
EasyDMARC
Los Angeles, United States
Self-serve DMARC, SPF, and DKIM platform for teams that need enforcement without a mail consultant.
Raised $20M Series A led by Radian Capital, September 2024
IRONSCALES
Atlanta, United States
AI email security that mixes automated remediation with a network of admin-reported phishing.
Launched Winter 2026 agentic release with Red Teaming, Phishing SOC, and Simulation agents, March 2026
Island
Dallas, United States
Enterprise browser that embeds DLP, ZTNA, and last-mile control into Chromium instead of another VDI farm.
Raised $250M Series E at a $4.8B valuation, March 2025
Material Security
San Francisco, United States
Workspace security for Google and Microsoft 365 that assumes the mailbox will get owned and limits the blast.
Published original analysis of the May 2026 Composio Gmail OAuth token breach, June 2026
Reco
New York, United States
SaaS and agent security that maps every app, identity, and AI connector, then remediates the risky ones.
Raised $30M Series B, total funding $85M, February 2026
Red Sift
London, United Kingdom
Email authentication and brand protection that gets domains to DMARC enforcement without a DNS circus.
Won a 2025 Cybersecurity Excellence Award for OnDMARC, March 2025
Sublime Security
Washington, United States
Agentic email security with open detection rules and AI that writes new coverage in hours.
Raised $150M Series C led by Georgian, October 2025