tento emviar um email usando servidor IIS

opa esse é o erro que esta dando

Warning: mail(): SMTP server response: 550 5.1.1 <aviso@teste.com.br> User unknown; rejecting in C:\oscommerce-2.2ms2-051113\catalog\includes\classes\email.php on line 520Warning: Cannot modify header information - headers already sent by (output started at C:\Paginas\Paginas_FM\LojaPadrao\oscommerce-2.2ms2-051113\catalog\includes\classes\email.php:520) in C:\oscommerce-2.2ms2-051113\catalog\includes\functions\general.php on line 34

estou usando o osCommerce num servidor IIS

alguem poderia me ajudar?

arrumei hehe desculpe!