Not sure why you want a list of all incoming emails...  

BUT (at least for me) - it would be great if a list could be generate of all the emails that are in the contacts, so that we could auto- approve initial spam filters (or grey list ) ?

~~~

Even if there is some mechanism to do that on  THE mail server.. when one has 4 inbound email servers.... everybody and everyone goes through all the spam checks anyway... which takes up a lot time/resources....  I know that after all the spam checks.. it looks at addresses.. but it would be great if it did that BEFORE everything else.