[exim] ACL question

Hi, I've been using exim for awhile but now just beginning to experiment
with it's power…


In exim.conf, I have this:

acl_check_rcpt:

   deny
      message = Domain is locally blacklisted
      senders = lsearch;/etc/mail/eximblacklist

If this is the contents of /etc/mail/eximblacklist:

specificuser@???


it works as expected and mail from specificuser is rejected . But, if this
is in /etc/exim/blacklist,

*@example.dom

OR

example.dom


it fails and mail is delivered.

What am I missing in order to reject all email from all senders from a
specified domain?


Thanks!