The Future of Email Signup: Passkeys, Magic Links, and Identity Without Passwords

The Status Quo

For 25+ years the signup flow has been: type an email, set a password, click a verification link, log in. Every account on the internet was built on this model. It's familiar, it's universally supported, and it's bad: passwords get reused, breaches expose hashes, users forget them, password managers patch the worst of it.

The industry is finally moving past this. Slowly.

Magic Links: Email as the Authentication Channel

Many newer services (Notion, Slack workspace invites, increasingly Auth0-based SaaS) use 'magic link' signin: enter your email, receive a one-time link, click to log in. No password, no second factor (the email account IS the factor).

Pros: no password to forget; no password hash to breach; the security of the account = the security of the email account.

Cons: if your email is breached or stolen, every magic-link account is too; the user experience (check email, click link, return to app) is slower than typing a password.

Passkeys: The Real Successor

Passkeys (built on WebAuthn / FIDO2 standards) let users log in with a device-stored cryptographic key instead of a password. The key is generated per site, never leaves your device, and is unlocked locally (with TouchID, FaceID, Windows Hello, or a device PIN).

Major platforms shipped passkey support starting 2022-2023: Apple, Google, Microsoft, 1Password, Bitwarden. Site adoption is real but uneven; the largest sites (Google, GitHub, Amazon, PayPal) support it. Most smaller sites don't yet.

What Passkeys Don't Replace

Passkeys replace passwords. They don't replace the initial signup or email itself:

• Account creation still typically involves email (for transactional communication, account recovery, identity)
• Account recovery, if you lose all your passkey-holding devices, falls back to email-based recovery flows
• Cross-device account migration still happens via email-mediated handshakes in many implementations

Email is sticking around as the identity-anchor layer even as it stops being the password-storage layer.

Where This Leaves Disposable Email

Disposable email use cases are largely unchanged:

• One-shot signups still want a throwaway address (passkey or not)
• Identity-compartmentalisation still wants email separation (passkey doesn't prevent cross-site email-based tracking)
• Marketing-inbox protection still wants disposable email at the signup step

Passkeys solve the password-management problem. They don't solve the email-identity problem. Both tools coexist.

The Federated Identity Alternative

'Sign in with Google' / 'Sign in with Apple' / 'Sign in with Microsoft' federated identity is the other modernisation path. Instead of a per-site account, you authenticate once via a major identity provider and that provider vouches for you to other sites.

Pros: one less account to manage; the identity provider handles 2FA + passkeys for you.

Cons: the identity provider knows every site you log in to; if you lose access to the identity-provider account, you lose access to every dependent site; centralisation risk.

Apple's 'Sign in with Apple' specifically supports per-app email aliases (Apple-generated relay addresses) at signup, which is the closest the industry has come to baking disposable-style email into the signup flow itself.

Where We're Going (Probably)

Best guess for the next 5 years:

• Passwords are increasingly the exception, not the default, for major sites
• Passkeys become standard on iOS / Android / desktop browsers
• Email remains the recovery channel and identity anchor
• Federated 'Sign in with X' grows but doesn't fully replace per-site accounts
• Per-app email aliases (Apple's model, possibly others) become more common
• Long tail of small sites still uses email + password for years to come

Bottom Line

Email signup is evolving but not disappearing. Passwords are being replaced by passkeys; email itself remains the identity layer. Disposable email and email aliases stay relevant because they address the email-identity problem, which is largely orthogonal to the password-management problem.

Related Guides

See also: 2FA setup guide, temp mail vs Apple Hide My Email, and Apple ID guide.