[Unit] Description=DomainKeys Identified Mail (DKIM) Submission Port Milter Documentation=man:opendkim(8) man:opendkim.conf(5) man:opendkim-genkey(8) man:opendkim-genzone(8) man:opendkim-testadsp(8) man:opendkim-testkey http://www.opendkim.org/docs.html After=local-fs.target network.target syslog.target [Service] Type=simple PIDFile=/var/run/opendkim/submission.pid ExecStart=/usr/sbin/opendkim -f -x /etc/opendkim/submission.conf ExecReload=/bin/kill -USR1 $MAINPID NonBlocking=yes [Install] WantedBy=multi-user.target