Restricting headers when forwarding messages

[Matthias Vallentin]

I would like to restrict the set of headers when I forward messages,
such as preventing X-Label to be included. My configuration contains
currently: 

    ignore *
    unignore From: Sender: Reply-To:
    unignore To: Cc: Bcc:
    unignore Subject:
    unignore Date:
    unignore User-Agent: X-Mailer:
    unignore X-Label:

    hdr_order From: Sender: Reply-To: \
        To: Cc: Bcc: \
        Subject: \
        Date: \
        User-Agent: X-Mailer: \
        X-Label:

Is there a setting to control the included headers when forwarding
emails? I would like to restrict them to the very basic ones: From, To,
Cc, Subject, Date.

    Matthias