[Exim] 550 Administrative prohibition

I guess this is a completely stupid question but ...

I have the following exim. conf file

...
begin routers

test_redirection:
driver = accept
transport = remote_smtp
no_more

begin transports

remote_smtp:
driver = smtp
...

If I telnet to the server on port 25 I get (after typing in the rcpt
to:<...> part) the following error

550 Administrative prohibition

The router is planned to accept mails from a specific subnet and deliver
them to "RCPT". The actual settings should allow this relaying for all
hosts. Any idea what I made wrong ?

Thank's for any help

Pedro