[exim] Aliases and Bounces

I have this to block email accounts over quota to avoid bounces.

# deny email addresses listed in file
deny recipients = lsearch;/etc/virtual/over_quota
        message = Email account over quota

Problem is if there is an aliases that forwards to that account I
still get bounces. Is there an easy way to make it see when it hits
an aliases to know one of the addresses it forwards too is over quota
or in /etc/virtual/over_quota? I doubt it.