Sending mail from multiple servers

[oxfordmusic.net <li...@ox...>]

Excuse me if this is not the right forum for this question, feel free to 
point me elsewhere.

I have two servers running sendmail. I have dk-milter installed on both but 
only one is working. As far as I can tell I followed the same installation 
steps on both machines.

In terms of the DNS set up, I have one policy record for the domain and two 
selectors (one for each server). dk-milter is set to use the relevant 
selector using the -S switch. The policy and both selectors seem to check 
out using the testing tools.

The only difference I can spot is in a mail from the server that's *not* 
working the list of headers in the signature 
(mime-version:to:from:reply-to:return-path:x-mailer:subject:content-type;) 
don't match the headers listed straight after the signature:
Date:
Message-Id:
MIME-Version:
To:
From:
Reply-To:
X-Mailer:
Subject:
Content-Type:
dk-milter has the same command line options on both servers so I'm not sure 
why this might be the case.

I am also having trouble testing.
I have an "r=" set up in my policy record but I don't seem to be getting the 
canonicalized message form from the autoresponder for messages sent from the 
server that's not working.

Any ideas as to why dk-milter isn't using all the headers to sign my 
meesages? Or as to why I'm not getting the debug emails?

Thanks
Andy