The Email Verification API
Blog post from Resend
The proposed Email Verification API aims to let websites confirm that users own submitted email addresses directly in the browser, avoiding the common interruption of sending users to their inboxes for one-time passwords or magic links. Currently available only as a Chrome origin trial with Gmail mailbox support, it is intended as a progressive enhancement alongside existing services that check address syntax, MX records, or SMTP availability. The process involves a browser, logged-in mailbox provider, website, and server: after a user enters an email address, the browser and provider generate a verification token that is placed in a hidden form field and validated by the server upon submission. Implementation requires an email input, a hidden token input containing a session-bound random nonce, and server-side token verification, which can involve DNS, network, and signature checks or be handled through a JavaScript package. By reducing registration friction while helping applications prevent invalid-address bounces and establish address ownership, the API could improve both user experience and email sender reputation.
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