Postfix Milter support

[Oriental Sensation]

Hi all,

I am wondering whether anybody had encountered this problem before:

I am trying to install OpenDKIM with filter support
(/usr/ports/mail/opendkim) and Postfix. However, the later cannot be
installed alongside Sendmail while OpenDKIM requires it... So how
exactly do I get Postfix and OpenDKIM w/milter playing together?

Thanks in advance.

/OS