yo lo uso asi
Código PHP:
<?php
function comp_mail($TestEmailAddress){
if(preg_match("/^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$/", $TestEmailAddress)){
return true;
} else {
return false;
}
}
?>