Passkeys and Email Security: Why Passwords Are Becoming Obsolete

Passwords have been the dominant method of online authentication for over sixty years. They are also one of the weakest links in digital security. Data breaches expose billions of passwords every year. Phishing attacks trick users into handing them over willingly. Weak and reused passwords create cascading failures across accounts. The humble password, despite decades of improvement, remains fundamentally broken.

Passkeys are the most significant advance in authentication security in a generation — and they are available on Sendora today.

What Is a Passkey?

A passkey is a cryptographic credential that replaces your password entirely. Instead of memorising a string of characters, you authenticate using your device's built-in security mechanism — your fingerprint, Face ID, or device PIN.

Under the hood, passkeys use public-key cryptography. When you register a passkey with Sendora:

1. Your device generates a pair of cryptographic keys — a private key and a public key.
2. The private key is stored securely on your device, protected by your device's hardware security module. It never leaves your device.
3. The public key is sent to and stored by Sendora.
4. When you log in, Sendora challenges your device to sign a unique token using the private key. Your device verifies your identity (fingerprint, Face ID, PIN) and signs the challenge. Sendora verifies the signature against your stored public key.

There is no password to steal, no password to phish, and no password to crack. The authentication is bound to your specific device and your specific identity.

Why Passkeys Are Dramatically More Secure Than Passwords

Immune to Phishing

Passkeys are cryptographically bound to the specific domain of the service they were created for. A passkey registered for sendora.me will not authenticate against a fake phishing site at send0ra.me or sendora.phishing.com. The domain mismatch is detected automatically and the authentication fails before your credentials can be compromised.

No Server-Side Password Database

Traditional password systems require services to store your password (or a hash of it) on their servers. If those servers are breached, your password is potentially compromised. With passkeys, the private credential never touches the server — the only thing stored is a public key, which is mathematically useless to an attacker without the corresponding private key.

No Reuse Risk

One of the most common attack vectors is credential stuffing — using email/password combinations leaked from one breach to attack other services. Since passkeys are unique per service and contain no shared secret, credential stuffing attacks are impossible.

Device-Bound or Synced

Passkeys can be stored locally on a single device (maximum security) or synced across your devices via Apple iCloud Keychain, Google Password Manager, or a dedicated password manager like 1Password. Synced passkeys offer convenience with a very high level of security.

How to Set Up a Passkey on Sendora

1. Log in to your Sendora account.
2. Navigate to Settings → Security.
3. Select "Add Passkey."
4. Follow your device's prompts to authenticate with your fingerprint, Face ID, or PIN.
5. Your passkey is registered and ready to use for future logins.

Once registered, you can log in to Sendora with a single biometric gesture — no password, no OTP code, no friction.

The Future of Email Authentication

The major platform vendors — Apple, Google, and Microsoft — have all committed to passkey support across their ecosystems. Browser support is universal. The infrastructure for passwordless authentication is in place, and adoption is accelerating rapidly.

Sendora is committed to being at the forefront of this transition. Passkey support is available today on every Sendora account, and we continue to invest in security technologies that make your inbox safer without adding friction to your workflow.

Enable your passkey today. It takes sixty seconds, and it may be the most impactful security decision you make this year.