how to add the Authentication-Results header with opendmarc

I am using postfix, opendkim, and opendmarc. Everything seems to be working well except the Authentication-Results header is not being added. I am only getting this header:

DMARC-Filter: OpenDMARC Filter v1.3.1 mydomain.com 9CAD616400E

Is there some setting that I missed?

Solution

I found my own answer. Hopefully this will help someone.

I was also running amavis and amavis was somehow controlling the Authentication-Results header. I fixed this by changing this setting from 1 to 0 in the amavis.conf

$enable_dkim_verification = 0

Now opendmarc is posting 3 Authentication-Results headers as expected, One for dkim, one for spf, and one for dmarc