PHP Email with Auth on Windows Plesk Enviroment

You need to use the email credentials you create in Plesk to authinticate to the server.

Also this uses the Pear library but should work regardless.

<?php
error_reporting(E_ALL);
ini_set('display_errors','On');

include('Mail.php');

$recipients = 'toaddress@something';

$headers['From'] = 'fromyou@yourdomain';
$headers['To'] = $recipients;
$headers['Subject'] = ' Test message ';
$body = 'Test message body';

$smtp_params["host"] = "localhost";
$smtp_params["port"] = "25";
$smtp_params["auth"] = true;
$smtp_params["username"] = "someemail@yourdomain"; // you made in plesk
$smtp_params["password"] = "you-secret-password"; //you set this in plesk for the email account

$mail =& Mail::factory("smtp", $smtp_params);
$result = $mail->send($recipients, $headers, $body);
if($result == 1)
{
echo 'Your message has been sent!
IP Address: '.$ip.' Code: '.
$result.' ';

}
else
{
echo 'Message failed!
IP Address: '.$ip.' '.' Code: '.
$result.' ';
}