Все понятно, тема больше не актуальна.Создавая конфиг для SA, мы должны помнить, что опция 'add_header' при работе SA из amavisd-new бесполезна, т.к. " amavisd-new never modifies mail body or let SA do it. All mail (header) editing is done by amavisd-new and not by SA. Even though SA does observe options in its configuration file to rewrite mail body and modify mail header, the result is purposely not used by amavisd-new. There are two reasons for that: be able to offer a guarantee the mail body will not be altered, and secondly, SA is only called once regardless of the number of recipients. This means the per-recipient handling of mail relaying and header editing needs to be done entirely in amavisd-new, as there are no provisions in SA to analyze mail once and then prepare different modifications for different recipients, based on the same spam analysis"
Что в переводе на русский язык звучит как: "не работает и работать не будет, т.к. amavisd-new не позволяет внешним программам править почтовые сообщения".
PS:
http://www.opennet.me/docs/RUS/dbmail/