Question on mail forwarding , 1 of 2

When I give out an email address, I always give out an alias that is  
unique and has only one purpose. For example, when I registered with  
the NY Times, I used [email protected] and never used the  
alias nytimes again for anything else. When I registered my copy of  
Warcraft III, I used [email protected] and  
(again) never used that alias again for anything else. When I signed  
up for this forum, I used [email protected].

Using this method, when a spam comes to me, I always know by what  
route it arrived. And if the particular email address gets "out  
there" somehow and that alias starts getting a lot of spam, I go onto  
my server and tell the server to forward all email to that alias into  
the server's bit bucket and I never see any email via that alias  
again. That alias is thereafter effectively "killed."  In the seven  
years I've had my server online, I have killed 13 email addresses  
because of spam.  It's a system which works very well for me.

I recently got a paid spamcop account, and since I've been actively  
reporting spam, I got curious about how much spam my server is  
sending to the bit bucket.  So to find out, I temporarily disabled  
all of the forwards.  All of a sudden, *quite* a bit of spam started  
arriving in my inbox via these formerly "killed" aliases.  On one  
particular address it looks like I was getting in excess of ten a  
day. Bastards!

To take advantage of my new spamcop account, I thought it would be  
interesting to set up the forwarding on my server to re-route emails  
sent to these dead aliases to my spamcop email address instead of  
into the server's bit bucket.  So, I told the server to forward said  
email to [email protected], my spamcop  
reporting address.  But instead of the reports getting taken by  
spamcop, I keep getting failure notices, like in the example in part  
two of this message.

Question: what am I doing wrong?  Or, is my assumption that Spamcop  
can accept forwards wrong? Or should my server be set to configure  
forwards in a particular way so that they are spamcop friendly?  I am  
confused. Please help.

:-|

Thanks,

Tim Wayne
San Francisco