[Exim] Personal blacklist

Hi,

I want to make a personal black list inmy database. I have already exim
running whit mysql. if i add the follow in exim.conf in the section
transport section.

warn    message       = X-Warning: $sender_host_address is in a black list
at $dnslist_domain
           log_message   = found in $dnslist_domain
           dnslists      =   ${lookup mysql{SELECT email FROM blacklist
WHERE email='${dnslist_domain}'}

This line dont work. Most i put somewhere els then in the transport section
?

Greets Wouter