Email Security

Best Leading Email Authentication Solution alternatives and competitors

10 active tools in the same primary category, including Sublime Security Platform, Vade, Humanix, and 7 more. Open any row for the full SecurityListing profile, pricing context, and integrations.

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All 10 alternatives

Sublime Security Platform
Founded in Washington, DC in 2019, Sublime serves Spotify, Reddit, Brex, Elastic, and Ramp, growing entirely through word-of-mouth without cold outreach or paid advertising. The company raised $60 million Series B in December 2024 led by IVP, bringing total funding to $93.8 million. Sublime offers a self-hosted Core platform free at any scale, with the first 100 inboxes free in its SaaS environment.
Email Security
Vade
Vade is a global leader in AI-powered email security. We protect 1.4 billion mailboxes worldwide. Discover our security solutions for MSPs, SMBs, and ISPs.
Email Security
Humanix
Humanix detects and stops social engineering attacks as they unfold across email, chat, voice, and help desk workflows.
Email Security
Tessian is Now Proofpoint
TESSIAN IS NOW Proofpoint Core Email Protection API and Adaptive Email DLP Proofpoint and Tessian, a leader in the use of advanced AI for email security, have…
Email Security
Trustmi Payment Security Platform
Payment fraud prevention platform monitoring email, ERP, and financial systems to detect and block social engineering attacks.
Email Security
Leak-Lookup
Leak - Lookup makes searching database leaks easy and fast. Offering username, email, ipaddress look-ups over thousands of data breaches / dumps, it
Email Security
Barracuda
Barracuda provides a comprehensive cybersecurity platform to protect organizations from all major attack vectors that are present in today’s complex threats. Block advanced threats with Barracuda’s c
Email Security
Abnormal
Founded in 2018 and headquartered in San Francisco, Abnormal has raised $557M in funding with a $5.1B valuation and serves over 5% of Fortune 1000 companies. The platform holds SOC 2 Type II, ISO 27001, ISO 27701, ISO 42001, and FedRAMP Moderate certifications, and is recognized as a Leader in the 2024 Gartner Magic Quadrant for Email Security Platforms with "Most Completeness of Vision" and a 99% customer "Would Recommend" rating on Gartner Peer Insights.
Email Security
S/MIME Certificates For Secure Email Communication
Certera S/MIME certificates secure email communications with encryption and digital signatures, helping protect sensitive messages and verify sender identity.
Email Security
Red Sift OnDMARC Platform
OnDMARC includes DNS Guardian to detect and block SubdoMailing attacks and domain takeovers that bypass DMARC, Red Sift Radar LLM assistant for 10x faster issue diagnosis, and integrated Verified Mark Certificate (VMC) provisioning through partnership with Entrust for BIMI implementation. The platform provides forensic reporting, real-time monitoring, and one-click integrations with SIEM, SOAR, and XDR platforms including Cisco Security, Microsoft, and cloud providers.
Email Security

FAQ

Are these “official” vendor pairings?: No. Alternatives are category peers for discovery, not paid placements. Vendors can still claim profiles and keep their product pages up to date.
Why is my favorite tool missing?: Only active listings in the same primary category appear. Multi-category products may move when their primary category is updated.