DKIM-milter only for outgoing

[Birta Levente]

Hi all

My postfix server is set up with amavisd-new and dkim-milter.
In the  main.cf:

content_filter = smtp-amavis:[127.0.0.1]:10024

smtpd_milters = inet:localhost:20209
non_smtpd_milters = inet:localhost:20209
milter_protocol = 2
milter_default_action = accept



With this configuration the DKIM signature is added even to the incoming 
mails and I don't see any reason to do that.

How can I set up the server to add DKIM signature only for the outgoing 
mails?

thanks

Levi