[exim] Removing a wildcard address

Hi all,

I have Exim set up with a wildcard address scheme (if you look at my
email address you can probably guess what it is). I'm doing it using:

data = ${lookup{$local_part}wildlsearch{/etc/aliases}}

Now, one of the addresses I use has started being nothing but spam, so I
want any email sent to that email address to be bounced. I think I
could figure out how to do this by modifying the exim config file, but
is there a way to do it by modifying /etc/aliases?

Do other people use this same technique, and have good tips on managing
addresses?

Thanks,

Ben