There is no way (well, easily) to change the behavior. The behavior is like this:
- Email IS left on the server upon download.
- An email IS deleted off the server if you delete it off Audrey's inbox.
Basically, it is kind of 50% "leave on server". That is, assuming your server is not configured to delete automatically upon download (that is kinda rare, but I have seen it).
What I "suggest" (it is kind of kludgey) is if you have the ability to configure you mailbox to forward a copy to another address, send it to another pop box (works well with a Yahoo POP account). Have Audrey check that second box. This is what I do and it works good enough.
It is really too bad Audrey does not have IMAP, as that would be the ultimate solution. There really was not much of a good way to handle multi-access with POP, and almost zero nationside ISPs support IMAP. I guess it would have been nice to have a checkbox for not deleting off the server even if it is deleted off of Audrey, but that did not happen.