spam_quarantine_to problem

[Nicolas]

Hello,
 I installed Amavis on Debian 6.0 .
 I configure $spam_quarantine_to = "spam\@$myhostname"; and the system work ok (forward mail) . But, when I view the mailbox of spam, the header "To:" is undisclosed-recipients:; not the original. This dificult forwad false positive from the spam account mailbox. How set Amavis to preserve original header "To:"

Thanks in advance.
N.
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