user-based filtering

Hi,

I got a problem to rewrite my transport_map in the master.cf: (the
problem is known a little, but i can't find a solution, and tried and
tried and tied)

xxx.xxx.xxx.xxx:10667 inet n - n -
- smtpd -o transport_maps=
this is where my checked emails from avmailgate get returned to postfix.


my transport_maps in main.cf works fine:
transport_maps = mysql:/etc/postfix/mysql/avmg_transport.cf
-> in mysql-database: user@mydomain.de ; smtp:[xxx.xxx.xxx.xxx]:10666

the problem is that in transport_maps the users, who subscribe
virusfiltering get into a continuous loop, because the transport_map
will be asked again, if the mail passes postfix the second, third... time.
the others, who aren't subscribe to virusfiltering, have no problems
with loops (mail will be delivered successfully).

has anyone an idea to handle this, and what options can be written in
master.cf with "-o".