How to run 'msmtp' mail command in php system()?

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<?php
// Define the email content and recipient
$to = 'recipient@example.com';
$subject = 'Test Email';
$message = 'This is a test email sent using msmtp command in PHP system()';

// Build the command to send the email using msmtp
$command = "echo "$message" | msmtp $to -t -s "$subject"";

// Execute the command using PHP's system() function
$result = system($command, $return_var);

// Check if the command was executed successfully
if ($result !== false) {
    echo 'Email sent successfully.';
} else {
    echo 'Failed to send email.';
}
?>