[Exim] sender_reject_recipients

I am running Exim 3.3.5 (will be upgraded to Exim 4 soon), trying to
reject a sender, i.e "support@???".
In the main configuration file I have added that
the following line
sender_reject_recipients = support@???

Then trying to test this as exim user by doing this

exim –f support@??? –bt abc@???

But its seems exim still routing the mail.

Any ideas?

Thanks