Why Can\'t I Send Mail Using PHP Mail() or PHPMailer?

Debugging PHP Mail() and/or PHPMailer

Despite extensive efforts to resolve a mailing issue from a PHP script, one user encountered a confounding error message: "Could not instantiate mail function."

Root Cause:

• Corrupted class.phpmailer.php file.

Solution:

• Download the latest version of class.phpmailer.php and replace the existing file.

Additional Debugging Techniques:

• Enable SMTP debugging in phpMailer:

<code class="php">$mail->IsSMTP();
$mail->Host = "localhost";
$mail->SMTPDebug = 2; // Enables SMTP debug messages</code>

• Utilize advanced error reporting and display options:

<code class="php">error_reporting(E_ALL);
ini_set("display_errors", 1);</code>

Additional Notes:

• The code snippet included in the question contained code from both the PHP mail() function and the PHPMailer class. This should be avoided as it can lead to unexpected results.
• The error message "Could not instantiate mail function" indicates that the mail() function could not be loaded. This can occur due to various factors, including incorrect PHP configuration settings or file permissions.
• It is recommended to use phpMailer's SMTP feature for increased reliability and debugging capabilities.

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