And what exactly would the dialog be for an e-mail sent to 500 people for which 125 don't have access? What if I i had 10 doclinks in the message. What happens then? It seems to be we are trying to add yet another layer of complexity to what should be a relatively simple task - that of sending an e-mail.
this seems too complicated to implement. What would be better is if there was a more descriptive (and friendly) message displayed when a user follows a link to a document they do not have access to. Currently it states the document has been deleted which is just confusing for the user.