Windows SMTP: SMTP server response: 550 5.7.1 Unable to relay

1) Go to: start > settings > control panel > Administrative Tools > Internet Information Services
2) Expand the ” (local computer)” node
3) Right click on your SMTP server > go to “Properties”
4) Click “Access” tab
5) Under Relay Restrictions, click the “Relay” button
6) Click “Add”
7) Select “Single Computer” and enter IP address 127.0.0.1
8) Hit OK, OK, OK (until the properties dialog is closed)

At this point it should work, but just to be extra sure, create a php page called SMTPtest.php and drop in the following code:

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<?
$to = “youremailaddress@domian.com”;
$subject = “test from localhost”;
$msg = “I completely understand SMTP servers now!”;
$headers = “From: localhost@localhost.com\nReply-To: localhost@localhost.com”;
$config = “-stfu@noob.com”;
mail(“$to”, “$subject”, “$msg”, “$headers”, “$config”);
echo “finished!”;
?>

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