Email Encryption Guide —
PGP, Post-Quantum & Beyond
Everything you need to know about email encryption in 2026. How PGP works, what post-quantum encryption protects against, and how to get full protection without technical expertise.
Not all email encryption is the same
There are three distinct levels of email encryption — each protecting against different threats. Understanding the difference is the first step to choosing the right service.
⚡ TLS — Transport encryption
What it does: Encrypts the connection between your device and the email server.
What it does NOT do: The email provider can still read your messages. Gmail uses TLS — and scans every message for advertising. TLS is the minimum, not the goal.
🔒 PGP — Content encryption
What it does: Encrypts the message content using a public/private key pair. Only the holder of the private key can decrypt and read the message — not even the email provider.
Standard since: 1991. Widely trusted and interoperable.
⚛️ Post-quantum — Future-proof encryption
What it does: Uses NIST-standardized algorithms (ML-KEM, ML-DSA) resistant to attacks from quantum computers.
Why it matters now: Encrypted data intercepted today can be decrypted in the future once quantum computers are available — "harvest now, decrypt later."
What are you actually protecting against?
Email encryption is not paranoia — it is a response to real, documented threats that affect ordinary users, professionals, and activists alike.
🏛️ Government surveillance
Legal orders can compel email providers to hand over messages. PGP means even compliant providers have nothing readable to give.
🔓 Server breaches
Email servers get hacked. PGP encryption at rest means stolen servers contain only unreadable ciphertext.
👁️ Mass surveillance
Intelligence agencies collect vast amounts of encrypted traffic today — planning to decrypt it once quantum computers are available.
🕵️ Corporate data mining
Gmail and similar services scan your email content for advertising. Encrypted email prevents this entirely.
Full encryption stack — active by default, no setup required
Onion Mail applies every layer of encryption automatically. You do not need to generate keys, install software, or understand cryptography to benefit from full protection.
🧅 What happens when you create an Onion Mail account
- PGP keys generated automatically — your key pair is created on account setup. Messages stored on our servers are encrypted immediately.
- Real-time security dashboard — after every login you see whether PGP is active, whether you are on Tor, and whether 2FA is enabled. No hidden surprises.
- Bring your own PGP key — if you already have a key pair, upload your public key and we will use it instead.
- Post-quantum messaging via PQC Server — integrated directly in your inbox for messages that need to stay private for years or decades.
- Tor .onion access — combine content encryption (PGP) with connection anonymity (Tor) for the strongest available email privacy.
Frequently asked questions about email encryption
What is the difference between TLS and PGP email encryption?
TLS encrypts the connection — the email provider can still read your messages. PGP encrypts the message content itself — only the key holder can decrypt it, not even the provider. For private communications, PGP is essential.
Does Gmail encrypt email?
Gmail uses TLS for transport but Google can and does read your messages for advertising purposes. It does not use end-to-end or at-rest encryption that would prevent Google from accessing your content.
Do I need to be technical to use encrypted email?
Not with Onion Mail. PGP is applied automatically — you do not need to generate keys or configure anything. The security dashboard shows you everything at a glance.
What is post-quantum email encryption and do I need it?
Post-quantum encryption protects against future quantum computers that could break today's encryption. If your communications need to remain private for years, you need it now — because data collected today can be decrypted later. See our PQC Server integration.
How is PGP different from ProtonMail's encryption?
ProtonMail uses a proprietary encryption system between ProtonMail users. Onion Mail uses standard PGP, which is interoperable with any PGP-compatible software worldwide. See our full comparison.
Encrypted email — active from the moment you sign up
No setup, no configuration, no technical knowledge required. Create your account and PGP is ready instantly.