Why Am I Getting Gmail SMTP Authentication Failures in My PHP Code?

Unable to Send Email via GMail SMTP Server: Authentication Failure

Attempting to send an email through GMail's SMTP server from a PHP page often results in an authentication failure error, leaving users frustrated. The provided PHP code is particularly vulnerable to this issue, as it appears to lack essential configuration settings.

To resolve this problem, the correct PHP configuration is crucial. The code should include the following parameters:

• SSL Encryption: Gmail SMTP requires a secure connection, so the 'host' parameter should be set to 'ssl://smtp.gmail.com'. This enables SSL encryption, ensuring secure data transmission.
• Port Configuration: The 'port' parameter should be set to '465', as it is the designated port for SMTP over SSL.
• Updated PHP Mail Library: Ensure you are using the latest version of the PHP Mail Library (PEAR Mail) to benefit from its enhanced features and bug fixes.

Here's the updated PHP code that resolves the authentication failure issue by incorporating these essential settings:

// Pear Mail Library
require_once "Mail.php";

$from = '<[email&#160;protected]>';
$to = '<[email&#160;protected]>';
$subject = 'Hi!';
$body = "Hi,\n\nHow are you?";

$headers = array(
    'From' => $from,
    'To' => $to,
    'Subject' => $subject
);

$smtp = Mail::factory('smtp', array(
        'host' => 'ssl://smtp.gmail.com',
        'port' => '465',
        'auth' => true,
        'username' => '[email&#160;protected]',
        'password' => 'passwordxxx'
    ));

$mail = $smtp->send($to, $headers, $body);

if (PEAR::isError($mail)) {
    echo('<p>' . $mail->getMessage() . '</p>');
} else {
    echo('<p>Message successfully sent!</p>');
}
?>

By implementing these modifications, your PHP script should now be able to send emails through GMail's SMTP server without encountering authentication failures.

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