Problem when sending external emails from workstation

[Ari Arantes Filho]

Hi,

    My qmail instalation is working - almost!!!

- I can send message to anywhere using qmail-inject.
- I can read messages from any workstation using any client program
(netspace, outlook, ...)
- I can only send messages from the workstation to a local domain, when I
try to send to <someone>@yahoo.com, for example, the qmail display an error:
553 sorry, that domain isn't in my list of allowed rcphosts (#5.7.1).

What is wrong?

Best regards,

Ari