add_filter hack is not working…

Hi there

I’m trying to hack a plugin by insert a dynamic variable into a wp_mail()…

The plugin initialize a send_to – variable with:

$this->send_to = get_option( ‘woocommerce_product_enquiry_send_to’ );

this is being used as follow:

if ( wp_mail( apply_filters( ‘product_enquiry_send_to’, $this->send_to, $product_id ), $subject, $message, $headers ) )
echo ‘SUCCESS’;
else
echo ‘Error’;

I have created a function:

function enquiry_to_vendor($email , $product_id ) {
global $product;

$vendors = get_product_vendors( $product->id );
if( $vendors ) {
foreach( $vendors as $vendor ) {
$email = $vendor->paypal_email;
}

return $email;
}

}

and applying add_filter:

add_filter( ‘product_enquiry_send_to’, ‘enquiry_to_vendor’, 11, 2 );

But I get nothing in the send_to field in the wp_mail() when do that add_filter – I have also tried to remove_filter() but with out luck…

Has this to be done in another way since WP ver. 4.1.1 or am I missing something ?

Cheers,
Adam