mod_filter - only allow some yahoo user

Hello.

Everyone - I have a problem please any one can solve this problem........

I just want to allow one user from yahoo to chat with the local user of the server.
for that i have apply following settings......

following setting works but which yahoo id i have added it didn't show in the roster.
and i can not get the message from that yhaoo id.

{acl, good_yahoo_users, {user, "juliet%yahoo.com", "yahoo.example.com"}}.
{acl, good_yahoo_users, {user, "", "yahoo.example.com"}}.
{acl, yahoo_users, {server_glob, "yahoo*"}}.

{access, mod_filter, [
% Filter incoming messages; allow only good messages

{allow, good_yahoo_users},
{deny, yahoo_users},

% Filter the rest, including outgoing messages

{filter_yahoo, all}
]}.

{access, filter_yahoo, [
% Users can send messages to good yahoo users

{allow, good_yahoo_users},

% but not to other yahoo users

{deny, yahoo_users},

% All non-yahoo traffic is allowed

{allow, all}
]}.