[Exim] sender_reject_recipients question

Hi,

I have virtual domains and for each virtual domain I would like to have
a different sender_reject_recipients list. I try something like

MYSQL_BL = SELECT bmail FROM blist where domain='${quote_mysql:$domain}';
sender_reject_recipients = mysql;MYSQL_BL

But this thing is evaluated right after the MAIL From: before $domaine
is known.

Does someone have an elegant way to implement such thing, TIP or any
pointer to the doc or FAQ.

Thanks
Fred