A quick check would be to load up phpmyadmin and check your notify queue table and see if you have double entries in there for starters.
Then, make a test mail script and send out a message with it. There are examples of this on ModMySite, like this:
Code:
<?
if ( mail ("xxxx@xxxxxxx.com", "Test message", "<h2>Hello</h2", "content-type: text/html; charset=iso-8859-1") )
echo "<font color=\"blue\">SUCCESS!</font>";
else
echo "<font color=\"red\">FAIL!</font>";
?>
Edit it, of course, so it goes to an email you can check, and see if that goes out double.
Smoge
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