[Exim] Deny domain

I have been trying to deny certain domains from sending email to me.

I have the following:

This basically selects the domain from the table.
domainlist blacklist_domains = mysql;MYSQL_Q_RBLBLACK

then in the acl section under acl_check_rcpt I have the following:

deny message = $domain is manually rejected.
     domains  = blacklist_domains

This does not work, what am I doing wrong?

Paulo