How does the choice between using mail() and an alternative method like mail() impact the offline usability of a PHP application within an intranet environment?

Using mail() function in PHP to send emails may not work in an intranet environment where there is no internet connection or the server is not configured to send emails externally. In such cases, an alternative method like a local mail server or a messaging system within the intranet can be used to ensure offline usability of the PHP application.

// Example of using a local mail server for sending emails in an intranet environment
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email sent from PHP using a local mail server.";

// Send email using local mail server
mail($to, $subject, $message);