This is what I have used.
<?
if(eregi("^[_.+a-z0-9-]+@[a-z0-9-]+(\.[a-z0-9-]+)*(\.([a-z]){2,4})\$",
$email)){
echo "Good Email!";
}
?>
Here is an excellent article on Regular Expressions.
Learning to Use Regular Expressions by Example
http://www.phpbuilder.com/columns/dario19990616.php3
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