Spam bounce message

[Rose, Bobby]

I've been playing with this in 4.0 and was wondering... Wouldn't it
better for MS to bounce back the message in such a way that it appears
to be a Mailer-Daemon rejection message?  Basically making it appear to
have come from the MTA?  I wouldn't think spammers are going to look
that closely at the header and see that it's not a real bounce.  If the
bounce message appears to be a rejection then "maybe" and I do mean
maybe, the address would get removed from their list.

-=B