Are there specific server settings or configurations that need to be adjusted to enable email sending using the mail() function in PHP?

To enable email sending using the mail() function in PHP, you may need to adjust the SMTP settings on your server. Specifically, you may need to configure the 'SMTP' and 'smtp_port' settings in your php.ini file to point to your email server's SMTP address and port. Additionally, you may need to ensure that your server allows outgoing connections on the specified SMTP port.

ini_set('SMTP', 'mail.example.com');
ini_set('smtp_port', 25);

$to = 'recipient@example.com';
$subject = 'Test Email';
$message = 'This is a test email.';
$headers = 'From: sender@example.com';

mail($to, $subject, $message, $headers);