How To Track Iis Generated Email Status

i've got a client that wants to be able to review records about IIS
generated emails.

in his own words, he wants the "ability to track and report message status
(i.e. how many messages were sent successfully, how many were blocked, how
many bounced back with an incorrect address)"

i'd start by adding a new row containing the email address, dateTime, etc
when first sending the email, but how to track the rest of the info? for
instance, if an email bounces back, does it bounce back to IIS or to the
"from" email address? what about the blocked (i.e. spam filter) emails? is
there a way to track blocked email? since most spam filters don't generate
response emails, there's not much i can really do about this, is there?

this will be run off an IIS6 server. can anybody tell me my options?