Software⏱️ 3 min read📅 2026-06-19

How to Fix: Mercury with Xamp does not mail, but gives no error

CI mail function not sending emails despite no errors, XAMPP Mercury mailserver logs sent emails but recipient does not receive them.

Quick Answer: Check the 'Return-Path' header in the debug output. Ensure it matches the email address used to send the email and is correctly configured in your PHP settings.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

The issue you're experiencing with sending emails using CodeIgniter and Mercury Mailserver in XAMPP is frustrating because it seems like the email is being sent successfully, but it's not reaching its intended recipient. This can be a challenging problem to solve, especially when there are no explicit error messages provided.

However, don't worry, we're here to help you troubleshoot and potentially resolve this issue. In this guide, we'll walk you through the possible root causes of this problem and provide step-by-step instructions for fixing it.

💡 Why You Are Getting This Error

  • The first main reason why this error happens is due to incorrect or missing configuration settings in your Mercury Mailserver. Specifically, ensure that the 'From' address is correctly set to the email address you want to send emails from, and that the 'Return-Path' field is also set to the same value.
  • An alternative reason for this issue could be related to the mail server's delivery mechanism. In some cases, the mail server may not deliver emails due to issues with DNS resolution or other network connectivity problems.

🔧 Proven Troubleshooting Steps

Verify and Correct Configuration Settings

  1. Step 1: Open the Mercury Mailserver configuration file (usually located at /xampp/mercury/config.php) and verify that the 'From' address is set correctly. Make sure it matches the email address you want to send emails from.
  2. Step 2: Check the 'Return-Path' field and ensure it's also set to the same value as the 'From' address. This ensures that when an email is sent, the mail server will use this address as the sender's address for delivery purposes.
  3. Step 3: Save the changes to the configuration file and restart the Mercury Mailserver service to apply the new settings.

Check Network Connectivity and DNS Resolution

  1. Step 1: Verify that your network connection is stable and functioning properly. Ensure that you have a working internet connection and that your mail server can reach the recipient's mail server.
  2. Step 2: Check the DNS resolution for the recipient's email address. You can do this by using online tools such as 'dig' or 'nslookup' to verify that the domain name resolves correctly.

✨ Wrapping Up

By following these steps and verifying that your configuration settings are correct, you should be able to resolve the issue and send emails successfully using CodeIgniter and Mercury Mailserver in XAMPP. If you're still experiencing issues, don't hesitate to reach out for further assistance.

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