'X-Envelope-From' missing in 2.7.0 ?

[Amedeo Rinaldo]

I've recently manually updated some (debian squeeze) amavisd-new to 
2.7.0 (from wheezy 2.7.0-1) and i've encountered the missing of 
'X-Envelope-From' header line in quarantined messages.

I've double checked in change-log and I've googled a little without 
finding any clues.

I've even tried to ..(maybe weird)..
$allowed_added_header_fields{lc('X-Envelope-From')} = 1;


..any help ? ..thnx