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Prerequisites

A Resend account with a verified sending domain and an API key (re_xxxxxxxxxxxx).

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Setup

  1. Open your form in the dashboard and go to the Integrations tab
  2. Choose Email (Resend)
  3. Paste your Resend API key
  4. Enter the From Email. It must be on your verified Resend domain (e.g. forms@yourdomain.com)
  5. Enter one or more To Email(s) to receive notifications
  6. Optionally change the subject line
  7. Save

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What you receive

Each submission sends one email with:
  • Subject "{your subject} - {form name}" (default subject: New Form Submission)
  • Every submitted field in a table
  • The time it was received
  • The submission ID, to find it in the dashboard

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Auto-reply

Turn on Auto-Reply to also send a confirmation to the person who filled in the form. It’s sent from your From Email with your Resend key.
  • Email Field: the form field that holds their address. Leave it empty and OSForms looks for a valid address in a field named email, Email, e-mail, user_email, contact_email, mail, or similar. If none is found, the auto-reply is skipped.
  • Reply Subject and Email Template: HTML with these placeholders:
Values are HTML-escaped. Placeholders with no matching field are removed.

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Testing

Once saved, use the test button in the integration settings to send a sample email (Test User, test@example.com) and confirm your setup. No real submission is created.

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Configuration reference

To set this up through the API, see the EMAIL config.

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Failure handling

If Resend rejects the request (for example an invalid API key or unverified domain), the integration is logged as failed and you get:
  • An in-app notification with the error message
  • An email alert at your account email, sent by OSForms rather than with your key
The submission’s integration logs in the dashboard show each attempt.
Resend bills you directly at their rates, including their free tier. OSForms never charges for integrations.