To enlarge on that, I have in main.cf and master.cf the following

main.cf
///////////////////////////////////////////////////////
# dkim
smtpd_milters = inet:127.0.0.1:8891
non_smtpd_milters = inet:127.0.0.1:8891
milter_default_action = accept
///////////////////////////////////////////////////////

master.cf

///////////////////////////////////////////////////////
submission inet n       -       n       -       -       smtpd
 -o syslog_name=postfix/submission
 -o smtpd_tls_security_level=encrypt
 -o smtpd_milters=inet:127.0.0.1:8891
///////////////////////////////////////////////////////



> On 3 Dec 2015, at 16:50, Steve Jenkins <st...@stevejenkins.com> wrote:
> 
> On Thu, Dec 3, 2015 at 7:51 AM, Noel Jones <njo...@megan.vbhcs.org 
> <mailto:njo...@megan.vbhcs.org>> wrote:
> Settings in main.cf <http://main.cf/> apply to all services.  Settings in 
> master.cf <http://master.cf/>
> only apply to the service they are listed in.
> 
> You may have a milter that is needed only in the "submission"
> service, such as a DKIM signer.
> 
> Thanks, Noel. I figured as much (and seeing he's running on 8891, I'm 
> guessing it's a DKIM signer).
> 
> Though running on submission only would prevent a milter like OpenDKIM from 
> verifying inbound mail, correct?

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