[exim] Folders being created for non-existant accounts

I have a virtual domain on my system that keeps getting 'accounts' created
for absolutely no reason. In the virtual users password file there are 3
accounts, but exim keeps creating & delivering mail to about 20 mailboxes.

Where could exim be getting this information from to create these mailboxes?
I have deleted the paths for these mailboxes, but as soon as mail comes in
they are re-created.

Any assistance would be appreciated.

Thanks!