MSMilter Header Order

[Andrew Martin]

Greetings! Although new to this list, I've been using MailScanner for 
several years with great results - thank you Shawn and contributors!

I've been testing MailScanner using the milter method and so far 
everything works well, with the exception of where milter headers are 
placed in the final message. My setup is:

Postfix -> OpenDKIM Milter -> OpenDMARC Milter -> MailScanner Milter

The (patched) OpenDKIM and OpenDMARC milters are configured to insert 
their Authentication-Results headers at index 0 using smfi_insheader(). 
This should theoretically insert these headers _above_ the Received 
header created by MSMilter (this works in non-milter mode where Postfix 
creates the Received header). Instead, they are appearing below the 
Received header created by MSMilter. I believe this leads SpamAssassin 
to ignore the Authentication-Results header (treated as not 
locally-generated/trusted headers).

Am I missing a configuration option that fixes this? If not, is there a 
workaround to get the headers to show up above the Received header?

- Andrew.