Updates a mailing spamfilter whitelist if wb is W.
$session_id, $client_id, $primary_id, $params
Parameters (in $params):server_id (int(11))
wb (enum('W','B'))
rid (int(11))
email (varchar(255))
priority (tinyint(3))
active (enum('n','y'))
Output:Returns the number of affected rows.