PHPMailer - AUTH not accepted - php

Question

I'm trying to run PHPMailer for an internal contact form and I am getting the error ERROR: AUTH not accepted from server. Here is my current code..
require_once('/includes/class.phpmailer.php');
include("/includes/class.smtp.php");
if (isset($_POST['submit'])) {
$mail = new PHPMailer(true);
$mail->IsSMTP();
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);
$message = htmlspecialchars($_POST['message']);
try {
$mail->Host = "192.168.6.6";
$mail->SMTPDebug = 2;
$mail->SMTPAuth = True;
$mail->Username = 'xxxxx';
$mail->Password = '***';
$mail->Port = 25;
$mail->AddAddress('xxx#xxx.com', 'xxxxx');
$mail->SetFrom($email);
$mail->Subject = 'New message from Contact Form';
$mail->Body = $message;
$mail->Send();
} catch (phpmailerException $e) {
echo $e->errorMessage();
} catch (Exception $e) {
echo $e->getMessage();
}
};

Answer 1

This error basically means that your attempt to authenticate was rejected by the remote server. Different PHPMailer settings (well SMTP settings) are required by different remote mail servers.
This could be caused by
Using the wrong port
Using the wrong host
Incorrect user/pass
Incorrect SMTPSecure
Example SMTP setup:
Gmail: use of phpmailer class
Hotmail: phpmailer with hotmail?

Answer 2

If you are using this internally, you may not need to use SMTP authentication at all, depending on your server settings. Try this and see if it works:
require_once('/includes/class.phpmailer.php');
include("/includes/class.smtp.php");
if (isset($_POST['submit'])) {
$mail = new PHPMailer(true);
$mail->IsSMTP();
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);
$message = htmlspecialchars($_POST['message']);
try {
$mail->Host = "192.168.6.6";
$mail->SMTPDebug = 0;
$mail->SMTPAuth = False;
$mail->Port = 25;
$mail->AddAddress('xxx#xxx.com', 'xxxxx');
$mail->SetFrom($email);
$mail->Subject = 'New message from Contact Form';
$mail->Body = $message;
$mail->Send();
} catch (phpmailerException $e) {
echo $e->errorMessage();
} catch (Exception $e) {
echo $e->getMessage();
}
};