[Exim] open relay

Hello list,

I got a problem with open relay... exim 3.35, redhat linux
Normally all bad is rejected but instead of one:

telnet myhost:25
    HELO myhost.com
    MAIL FROM: me@???
250 <me@???> is syntactically correct
    RCPT TO: "outside@???
250 <"outside@???> verified
    DATA
354 Enter message, ending with "." on a line by itself
250 OK id=17pZz2-0001tV-00

How can I close my relay ?

I already set

headers_check_syntax
headers_sender_verify
receiver_verify
sender_verify


Thanks for your help.

Thomas.

--
Thomas Baumann // tirili+list.exim@???