[Exim] where put the quota line

Hi,

I`m trying to make a quota for every user. I have add the folow line by
begin transport.
quota = ${lookup mysql{SELECT quota FROM passwd \
      WHERE email='${local_part}@${domain}'}}

But when i check the mysql log exim wilt not check de quota`s Is there
someone who can tell me if i most do put the line somewhere els ?

Greets Wouter