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I am working with the "secure" version of contact form script 12.1 described in "Chapter 12 - Security Methods" (pg. 365) but would like to modify this so that rather than simply printing a thank you message, the user is redirected to a thank you page. I have tried replacing the given script: // Minimal form validation: if (!empty($scrubbed['email'])) { // Create the body: $body = "Name: {$scrubbed['name']}\n\nComments: {$scrubbed['comments']}"; $body = wordwrap($body, 70); // Send the email: mail('XXX@XXX', 'Contact Form Submission', $body, "From: {$scrubbed['email']}"); // Print a message: echo '<p><em>Thank you for contacting me. I will reply some day.</em></p>'; // Clear $_POST (so that the form's not sticky): $_POST = array(); } else { echo '<p style="font-weight: bold; color: #C00">Please enter a valid email address.</p>'; } with modified: // Minimal form validation: if (!empty($scrubbed['email'])) { // Create the body: $body = "Name: {$scrubbed['name']}\n\nComments: {$scrubbed['comments']}"; $body = wordwrap($body, 70); // Send the email: mail('XXX@XXX', 'Contact Form Submission', $body, "From: {$scrubbed['email']}"); // Redirect to thank you page: header("Location: thankyou.htm"); exit(); // Clear $_POST (so that the form's not sticky): $_POST = array(); } else { echo '<p style="font-weight: bold; color: #C00">Please enter a valid email address.</p>'; } ..but get the error: Warning: Cannot modify header information - headers already sent by (output started at /websites..... Reading about this, it seems nothing can be sent to the browser before header is used. But however I try to move things around, I cannot get this to work. Could you advise how/where this redirect should be used within this script? Thank you.