bcc from a specific user

Hello,

I want to bcc mails from a specific user. I had read that this not
possible now but Wietse is thinking about a recipient_bcc_maps and
sender_bcc_maps.

How far is this work gone?

Is there a workaround for this problem? We use virtual delivery and want
to bcc the mail from a specific sender to all members of a mailinglists.

Thanks in advance!

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h.wulff