[exim] Domain Alias for Virt Domains

Greetings,
We recently installed exim (after having previously run qmail).

So far it's running great except that the aliases are doing something
a little funky and I'm not quite up to speed on writing the rules.

Here's what's happening:

username: dave
email address: dave@???

dave@??? is receiving email for dave@??? and
dave@???, basically any domain we host that doesn't have a
user with the alias of dave.

I have a subdir called /etc/exim/virtual, in there are files for each
domain with all the users and aliases listed.

In the /etc/exim/ dir there is a file called domainlist, which is a
list of all the domains.

Here is the alias rule in the exim.conf file:

virtual:
driver = redirect
domains = dsearch;/etc/exim/virtual/
data = ${lookup{$local_part@$domain}lsearch{/etc/exim/virtual/$domain}}


Any other info I need to supply?

Thanks!

Scott