Follow these steps

1. setup postfix normally

2. edit /etc/postfix/main.cf and add:

	content_filter=xamime

3. edit /etc/postfix/master.cf and add:

	xamime unix - n n - 10 pipe user=xamime argv=/usr/local/xamime/xamime /usr/local/xamime/xamime.cfg (${sender}) (${recipient})
	localhost:10025 inet n - n - - smtpd -o content_filter=

4. Install Xamime

5. Create a  group "xamime" and an user "xamime" (with it's primary group set as xamime)

	groupadd xamime
	useradd -g xamime xamime

6. Copy this special Xamime binary over the installed one


7. chown -R xamime.xamime /usr/local/xamime

8. postfix start


... should work... check for permissions problems etc.