amavisd split local and remote recipient in different email

[Giovanni Mancuso]

Hi,

i have an amavisd-new integrated with postfix through content_filter.
In amavisd.conf i have:

........
........
$mydomain = 'example.com';
........
........
@local_domains_maps = ( [".$mydomain"] );
........
........

The problem is that if i send a spam's mail to 5 recipients (3 of
example.com and 2 of gmail.com) amavisd splits this mail in two
different mail (1 for the example.com domain and another for gmail.com).

This actions create a problem in my backend smtp server.

If i delete [".$mydomain"] from @local_domains_maps, it doen't split
email and i don't have problem.

Is there another way to tell it not to split the emails?

Bye