amavis doesn't quarantine all spam mails

I'm trying to create a special mail account to collect all incoming spam with the purpose to later on be able to train the SA more easily for the whole domain.

We're using Zimbra, but as far as I can see the problem is not zimbra related, because it's "almost" working.

The setting I have are:

$quarantine_method_by_ccat{+CC_SPAMMY}     = 'smtp:127.0.0.1:10025'; 
$quarantine_method_by_ccat{CC_SPAMMY.",1"} = 'smtp:127.0.0.1:10025'; 
$quarantine_method_by_ccat{+CC_SPAM}       = 'smtp:127.0.0.1:10025'; 
$quarantine_to_maps_by_ccat{+CC_SPAMMY}     = ['spam@domain']; 
$quarantine_to_maps_by_ccat{CC_SPAMMY.",1"} = ['spam@domain']; 
$quarantine_to_maps_by_ccat{+CC_SPAM}       = ['spam@domain']; 

@spam_lovers_maps = @bypass_spam_checks_maps = ( [ qw('spam@domain',) ], ); 
$final_virus_destiny      = D_BOUNCE; 
$final_banned_destiny     = D_BOUNCE; 
$final_bad_header_destiny = D_PASS; 
$final_spam_destiny       = D_DISCARD; 
$final_destiny_by_ccat{+CC_SPAMMY} = $final_spam_destiny; 

So far so good, most of the time as spam-admin I receive messages like:

http://pastebin.com/fqaCsZR8

But some mails will be discarded and not even send to spamasassin (I think) and it doesn't matter if it's spam or not.

http://pastebin.com/2Uh34gBT

And this was even just an autoresponder from the user himself. Issued by the server.

Or http://pastebin.com/bePUrEtf for more or less spam mails. Just no report and this is neither an autoresponder nor a mail-daemon message.

Any Ideas?

Thanks!