I had issues with Dkim in the past and evetually got it working with as notated here;
Thank you phoenix!

However I recently upgraded from 8.0 to 8.0.4 and installed the patch and just noticed that my DKIM is no longer working... I decided to revisit the opendkim wiki and just run through the steps really quick to make sure everything was still setup correctly.
Guide to Install OpenDKIM for multiple domains with Postfix and Debian

But I get the following results;
================================================== ========
Summary of Results
================================================== ========
SPF check: pass
DomainKeys check: neutral
DKIM check: neutral
Sender-ID check: pass
SpamAssassin check: ham
I do have the milter checkbox checked in Zimbra Admin, but I get no joy with openDKim anymore...

If I check my dkim at;
Dkim Checker
I get the following;
This is a valid DKIM key record
v= DKIM1
Key type
k= rsa
Public key
p= MIGfMA0GCS.....

netstat -antup | grep 12345
tcp 0 0* LISTEN 9939/opendkim
Can anyone see what is going on here?