How to Troubleshoot \"Message Sending Failed\" Error When Sending Mail in PHP?

Debugging PHP Mail() and PHPMailer

You're encountering an issue sending mail from a PHP script, receiving an enigmatic "Message sending failed" message with no additional details. Let's explore potential causes and identify solutions.

PHP Mail() Functionality

When mail() is invoked, it relies on the installed mail transport agent (MTA), usually configured within your hosting environment. Unfortunately, you lack SSH access, making it challenging to directly verify the MTA configuration.

PHPMailer Exception

The appearance of code from class.phpmailer.php suggests a corruption issue with the downloaded library. Try re-downloading the fresh version from the official repository and incorporating it into your project.

Additional Debugging Tips

To gain more insights into the mail delivery process, consider the following:

• Configure PHP Logging: Utilize PHP's error_log() function to capture detailed error messages related to mail delivery.
• SMTP Configuration: Implement SMTP functionality using PHPMailer, as demonstrated in the provided code example. SMTP allows for better control and debugging capabilities.
• PHPMailer Debug Output: Enable SMTP debugging by setting PHPMailer's SMTPDebug property to 2 or 1 for verbose or concise error messages, respectively.

Other Considerations

• Verify that the server allows outgoing mail connections from your script.
• Inspect your code for potential typos or configuration errors in the mail-related parameters.
• Temporarily deactivate any security mechanisms, such as firewalls, that may block mail deliveries.

The above is the detailed content of How to Troubleshoot \"Message Sending Failed\" Error When Sending Mail in PHP?. For more information, please follow other related articles on the PHP Chinese website!