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A password-reset email template is only one part of a secure reset flow. Protect the account through the request endpoint, reset token, destination page, completion notification, locale and address handling, and sender authentication. HTML affects how the message is presented; it does not make the reset process secure or guarantee consistent rendering across email clients.
1. Keep account existence private at the request step
When someone requests a reset, return the same message whether the submitted address belongs to an account or not. OWASP also recommends uniform response timing and abuse protections such as per-account rate limiting or CAPTCHA. These controls belong in the service handling the request, not just in the email wording.
A localized confirmation can say that instructions will be sent if the address is associated with an account. Use equivalent wording and behavior for both cases; otherwise, the response may reveal which addresses are registered. OWASP’s Forgot Password Cheat Sheet recommends a consistent message for existing and nonexistent accounts.
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The email’s link carries a credential: whoever can use a valid token may be able to change the account password. Generate a cryptographically secure, sufficiently long token; store it securely; bind it to the intended user; and make it single-use and time-limited. Do not change the account until the service validates the token.
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Apply limits to token attempts as well as reset requests. After a token succeeds, invalidate it so it cannot be reused. OWASP describes these token protections in its Forgot Password Cheat Sheet and reset-functionality testing guidance.
3. Build links from a trusted HTTPS destination
Construct reset links using a hard-coded or allowlisted domain, not a domain taken from the incoming request’s Host header. Use HTTPS for the reset destination. That prevents an untrusted request header from influencing where a credential-bearing link sends the recipient.
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Keep the token away from third-party domains and resources that could receive it. OWASP warns that exposure to a third party can put the token at risk. On the reset page, set Referrer-Policy: no-referrer to reduce the chance that the token-bearing page URL is disclosed through a referrer. OWASP also recommends this policy in its forgot-password guidance; its testing guidance covers risks around reset functionality.
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The message should help the intended recipient reach the reset flow; it should not include or ask them to email a password. Never send a password in email. Once a password change is completed, send a notification so the user can recognize a change they did not make. OWASP covers these practices in its Forgot Password Cheat Sheet.
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A template can make the action and its destination clear without becoming the security boundary. For example, a server-rendered message might contain:
<p>{{localized_reset_intro}}</p>
<p><a href="{{trusted_https_reset_url}}">{{localized_reset_action}}</a></p>
<p>{{localized_expiry_or_help_text}}</p>Replace each variable with approved text or a link generated by the reset service. The URL must use the trusted HTTPS destination and token lifecycle described above; do not let a template editor or incoming request supply an arbitrary destination. The example illustrates message structure, not a guarantee that every client will render the same HTML.
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5. Define address and locale behavior deliberately
Email addresses can include internationalized domains, and internationalized mail standards also address local-parts. Preserve the address the person entered for display, while defining a consistent comparison policy for account lookup. Normalize the domain according to that policy, and handle internationalized domains and local-parts deliberately rather than assuming every address can be transformed the same way.
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OWASP’s Email Validation and Verification Cheat Sheet discusses address handling. The IETF’s RFC 6530 provides an overview and framework for internationalized email. These sources do not prescribe how a product should select a message language or choose a fallback locale. Set that policy from product requirements, then test the actual localized message and reset flow.
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6. Authenticate the sending domain and test the message format
Configure SPF, DKIM, and DMARC for the sending domain to help prevent spoofing. These mechanisms are domain-authentication controls; they do not guarantee inbox placement. OWASP’s reset-functionality testing guidance recommends checking sender-domain authentication. For internationalized mail contexts, see the IETF’s RFC 8616 and RFC 6530.
RFC 5322 specifies Internet message syntax, not email-reader interface features or a universal HTML/CSS rendering standard. It recommends message lines no longer than 78 characters and sets a maximum of 998 characters excluding CRLF; these are message-format limits, not an HTML design recipe. See the IETF’s RFC 5322. Test the message in the clients and locales your product supports, and provide a plain-text alternative if that is part of your email implementation. Do not infer portability or accessibility from valid HTML alone.
Quick Recap
Implementation checklist
- Return equivalent reset-request messages and timing for account and non-account addresses; limit request abuse.
- Generate secure, user-bound, single-use, time-limited tokens; limit attempts and invalidate a token after use.
- Use a trusted HTTPS reset domain, keep tokens away from third-party resources, and set
Referrer-Policy: no-referreron the reset page. - Use the email to direct the recipient to the reset flow; notify them after a completed password change, and never email a password.
- Document address comparison, domain normalization, internationalized-address handling, locale selection, and fallback behavior.
- Authenticate the sending domain and test message behavior in the email clients and languages the product supports.
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