Exim: create an ACL for destination mails

[enboig]

I take care of a shared server, and some users send mail to lot of out-of-date addresses. This is lowering the server reputation when sending mails.

I want to make an ACL filter to known-to-be-bad address from a sql table (I could convert it to a file with a cron script) and stop mails before they are send.

I am looking at http://www.exim.org/exim-html-current/doc/html/spec_html/ch-access_control_lists.html but I have some trouble understanding it. Any hint?

thanks.