I have an email address that is checked by gmail through POP3.  I also have enabled it so I can "send mail as" for that account.  When someone sends me a google docs link to that pop3 email, I am unable to open it as I don't have "permission".  Is there any way to allow google docs to recognize when a user has access to the pop3 email so they can open the google doc?  For now, I have just asked the person to re-send me the doc at the gmail address.