[opendmarc] Skip dmarc checks for email sent over authenticated sockets

opendmarc checks fail for mail sent over (SMTP AUTH) submission
   ports. Adding this directive skips checks for those emails, and
   clears the logs of related errors.

   See https://github.com/tomav/docker-mailserver/issues/703

target/opendmarc/opendmarc.conf

@@ -10,3 +10,5 @@ HistoryFile  /var/run/opendmarc/opendmarc.dat
 
 AuthservID          HOSTNAME
 TrustedAuthservIDs  HOSTNAME
+
+IgnoreAuthenticatedClients true