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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteTo activate a new account by email, create it in a pending state, send a single-use verification link or code to the submitted address, and mark the address verified only after the user successfully confirms it. Then require the user to sign in through the normal authentication flow. Email confirmation shows that someone can access that mailbox; it does not prove their real-world identity.
How email account activation works
- Collect and check the address. Use a tolerant format check rather than a rigid pattern that could reject valid addresses. A well-tested email-address library can help.
- Create a pending account. Store the submitted address and apply a documented, consistent comparison policy. OWASP recommends lowercasing the domain while preserving the original input; do not assume that dots, plus-addresses, or other provider-specific conventions mean the same thing for every provider.
- Generate a confirmation secret. Use a cryptographically secure random token or code, associate it with the intended account and verification purpose, and give it an expiry. It should work once only.
- Send the confirmation. Email a link or code with clear instructions, including how to request another message if needed.
- Validate the response. Check that the token or code belongs to the pending account, has not expired, and has not already been used. On success, mark the address verified and invalidate the secret.
- Require normal sign-in. Do not treat a visit to the verification link as an authenticated session. Have the user authenticate through the application’s ordinary sign-in process.
OWASP describes the common pattern as asking a user to click an emailed link or enter an emailed code in its Input Validation Cheat Sheet. The implementation details should fit the service’s risk and client environment.
Choose a link or a code
| Method | Typical user experience | Practical consideration |
|---|---|---|
| Email link | Usually a single click. | A mail scanner may open the link, or the message may be opened on a different device. Ensure confirmation is bound to the intended account and action. |
| Email code | The user switches to the app and enters the code. | Entering the code in the intended app session can suit environments where link handling is awkward. Protect it against guessing, reuse, and expiry. |
Neither method is universally better. Both need secure generation, account binding, one-time use, an expiry, and controls on repeated attempts. OWASP discusses both approaches in its confirmation guidance.
Set safe token and expiry rules
OWASP’s Input Validation Cheat Sheet gives a token length of at least 32 characters and an eight-hour expiry as examples for email ownership verification. These are implementation guidance, not universal legal limits. Generate tokens with a cryptographically secure source, bind each to the relevant pending account and purpose, allow only one successful use, and invalidate it on confirmation.
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For a narrower context, NIST SP 800-63A-4, published in July 2025, specifies that covered email confirmation codes have at least six decimal digits or equivalent, remain valid for no more than 24 hours, and are invalidated after use. Those requirements apply to the standard’s identity-proofing and enrollment scope; they should not be presented as a general rule for every consumer website. See the NIST SP 800-63A-4.
Decide how long pending accounts remain and what happens after a confirmation expires. The appropriate pending-account retention period is an application policy; do not confuse it with the validity of a particular token or code.
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If the activation email never arrives or the link expires
- Ask the user to check the address they entered, including spelling, and check spam or junk folders.
- Provide a resend action that issues a fresh, time-limited confirmation secret rather than extending or reusing a previously consumed token.
- Rate-limit resend requests and confirmation attempts, and monitor repeated activity.
- Use consistent responses so the resend flow does not reveal whether an address is already registered.
- Define what happens to stale pending accounts, such as allowing a new confirmation request or requiring registration to be restarted.
Keep the resend experience helpful without disclosing sensitive account state. OWASP’s Email Validation and Verification Cheat Sheet covers anti-enumeration, token handling, activation, and logging considerations.
Protect account state and user privacy
- Do not enable an unverified account. Keep it pending until confirmation succeeds.
- Do not log secrets. Avoid logging full verification URLs or tokens. Mask or pseudonymize addresses in logs.
- Limit guessing and replay. Rate-limit attempts, reject expired or previously used secrets, and bind a secret to the account and action for which it was issued.
- Normalize addresses deliberately. Preserve the original submitted value and apply the same comparison rules consistently; avoid provider-specific transformations unless the application fully controls that behavior.
- Do not equate mailbox access with identity. Email verification confirms access to an address, not the person’s identity or authorization to access protected information.
Registration assurance should match the sensitivity of the service. OWASP’s registration testing guidance frames registration requirements around the security needs of the information being protected.
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When a user changes their email address
Treat an address change as a sensitive account change, not as a routine edit. OWASP’s Authentication Cheat Sheet describes safeguards that include reauthentication, recording the proposed address as pending, notifying the old address, and confirming the new one. Keep the existing verified address in force until the new address is confirmed, according to the application’s policy.
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