Contact Form Not Working: Complete Troubleshooting Guide

A Broken Contact Form Is a Silent Revenue Killer

Visitors try to reach you, fail, and go to a competitor. Most businesses discover the problem only after a client mentions it — or after weeks of zero inquiries.

Identify the Symptom First

• Form submits without error but no email arrives?
• Form shows an error message on submit?
• Clicking submit does nothing at all?
• Form submits but thank-you page never loads?

8 Common Causes and Fixes

1. Emails Going to Spam

Cause: PHP mail() sends without authentication, triggering spam filters.
Fix: Switch to SMTP + PHPMailer. Send FROM your domain email ([email protected]).
WordPress: Install WP Mail SMTP, configure with Gmail, SendGrid, or Brevo.

2. Missing SPF / DKIM Records

Cause: Domain lacks email authentication DNS records.
Fix: Add SPF: v=spf1 include:yourhostingprovider.com ~all and DKIM from your email provider.

3. JavaScript Error

Fix: Open Chrome DevTools (F12) → Console tab. Fix any red errors. Common culprits: missing jQuery, plugin conflicts.

4. CSRF Token Expired

Fix: Regenerate token on each page load: $_SESSION["csrf"] = bin2hex(random_bytes(32));

5. Over-Strict Validation

Fix: Test with simple input first. If it works, your regex is blocking valid inputs.

6. Hosting Blocking Outbound Email

Fix: Use external SMTP — Brevo (300 free emails/day) or SendGrid (100/day free).

7. Wrong Form Action URL

Fix: Inspect the form HTML: <form action="/send-message.php">. Verify the script exists on the server.

8. File Upload Exceeds Limits

Fix: Add to .htaccess: php_value upload_max_filesize 10M

Verify Your Fix

• Check inbox AND spam folder after submitting
• Use Mail-tester.com to score email deliverability
• Use MXToolbox to verify SPF/DKIM records

Still broken? Contact me — I fix contact forms as part of my maintenance service.