Umbra Mail
Umbra Mail is an encrypted email host that runs on a zero-knowledge infrastructure, encrypting messages at the client level so no server-side plain text exists. It offers self-destructing messages, no metadata tracking, and identity verification via an Access Vault, accessible at umbra-mail.com and through a Tor Onion address.
Key facts
What is Umbra Mail?
Send encrypted data without leaving a trace through a zero-knowledge mail host that keeps no metadata.
Who is Umbra Mail best for?
Privacy-conscious individuals and users seeking anonymous, encrypted email
What are its main limitations?
- No pricing information is published — the pricing URL returns a 404 error
- No information about storage limits, plan tiers, or account limits on the homepage
- Website is dated © 2024 and lists protocol version 4.0.2 without further documentation
Limitations are based on product materials or editorial synthesis; confirm on the official site.
When was this information verified?
October 19, 2026
Sources
- Official homepageofficial homepage · Oct 19, 2026
Key features
- ✓End-to-end client-level encryption with no server-side plain text
- ✓No metadata collection — no tracking of IP addresses, browser agents, or session durations
- ✓Optional self-destruct timers for messages that vanish after reading
- ✓Access Vault identity verification required to decrypt the inbox
- ✓Anonymous shadow identifier generated at signup instead of a personal identity
- ✓Secure Inbox, Sent Items, and Cold Storage folders with an incoming data stream view
- ✓Target encryption using SHA-256 with recipient UID, subject header, and payload body fields
Use cases
- →Sending sensitive messages that should not persist on a server in plain text
- →Sharing information that should disappear after the recipient reads it
- →Communicating without exposing IP address or browser metadata
- →Accessing encrypted mail over Tor via the Onion address
- →Using PGP keys alongside the hosted mailbox
Pros
- +Zero-knowledge architecture with client-side encryption
- +Explicitly states it does not log IP addresses, browser agents, or session durations
- +Built-in ephemeral/self-destruct message option
- +Tor Onion access and published PGP key for privacy-focused users
Cons
- −No pricing information is published — the pricing URL returns a 404 error
- −No information about storage limits, plan tiers, or account limits on the homepage
- −Website is dated © 2024 and lists protocol version 4.0.2 without further documentation
Positioning
- Core value: Send encrypted data without leaving a trace through a zero-knowledge mail host that keeps no metadata.
- Ideal for: Privacy-conscious individuals and users seeking anonymous, encrypted email
- Product type: Web app (browser-based mail client); also reachable via Tor Onion
Frequently asked questions
What is Umbra Mail?
Umbra Mail is an encrypted mail host built on a zero-knowledge infrastructure, where messages are encrypted at the client level and no server-side plain text exists.
How much does Umbra Mail cost?
Pricing is not published on the site — the pricing URL returns a 404 Not Found error, so no plans or prices are available.
Does Umbra Mail track my metadata?
The site states it does not track IP addresses, browser agents, or session durations.
Can messages self-destruct?
Yes. Umbra Mail offers optional self-destruct timers for packets that need to vanish after reading.
Is Tor access available?
Yes, the site lists a Tor Onion address alongside API docs and a PGP key in its footer.
How do I get an account?
You generate a unique anonymous 'shadow identifier' through the Join Umbra flow and verify identity via the Access Vault to decrypt your inbox.
You may also like
Curated suggestions based on similar categories.
Latch
Latch, now rebranded as DOOR, is a smart access and building automation platform for residential properties. It combines smart locks and readers, intercoms, cameras, smart home devices, and the DOOR OS property operating system with the DOOR App for residents and property teams.
Agent Control
The open-source control plane for AI agents that enables centralized policy enforcement, runtime governance, and step-level guardrails across agent workflows.
Port Radar for macOS
Nmap ("Network Mapper") is a free and open source utility for network discovery and security auditing. It uses raw IP packets to determine available hosts, the services they offer, operating system versions, and packet filters/firewalls in use, and it can rapidly scan large networks or single hosts.
HeimWall
HeimWall is an edge security platform combining Web Application Firewall (WAF), CDN, and managed DNS with a focus on data residency. It inspects every request at the edge to block attacks, bots, and abuse before they reach the origin, and offers cloud, hosted, and white-label reseller deployment options.
Clawdit
Clawdit is an open-source runtime security tool for AI agents that intercepts, logs, and enforces policies on every tool call an agent makes. It acts as a local-first black box recorder, providing visibility into agent actions and blocking malicious behavior.
AgentGuard
Scan AI Agent Skills for Threats in Seconds