[exim] exim and ldap

Hello all,

On my ldap database I have a multivalued attribute called "EurListsMember".
each value say if a contact are a member of a list, exemple :

cn: De Leeuw Guy
EurListsMember: AnnualReport TransportsNews ....

I try to configure exim to build a list dynamically when the localpart
is a list name (exemple : AnnualReport@???) and the sender is a
local sender.

probably :
${lookup ldapm { \

ldap://ldap.eurofer.be/o=Eurofer,c=be?mail?sub?(%26(EurListsMember=${local_part}))
\
} \
}

but I don't know where I put this lines, and how to configure the
restrictions.
Can you help me ?

Thanks in advance,

Guy