sometimes when you sign up for a site, you get email from another machine, like you might sign up at 'abc.com' and get email confirming your address from abc-mailer.com.
so when I go to administer an address, and enter an exclusive sender for that address, it would be nice to see what server the confirmation email really came from.
You could just provide a list of the addresses that have sent emails to the address I am editing.
Thanks