# /etc/init.d/opendkim start

[....] Starting opendkim (via systemctl): opendkim.serviceJob for opendkim.service failed because the control process exited with error code.
See "systemctl status opendkim.service" and "journalctl -xe" for details.
 failed!

# systemctl status opendkim.service

 ● opendkim.service - OpenDKIM DomainKeys Identified Mail (DKIM) Milter
   Loaded: loaded (/lib/systemd/system/opendkim.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2018-03-29 21:07:52 MSK; 8s ago
     Docs: 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
  Process: 1255 ExecStart=/usr/sbin/opendkim -x /etc/opendkim.conf (code=exited, status=78)

мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Unit entered failed state.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Failed with result 'exit-code'.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Service hold-off time over, scheduling restart.
мар 29 21:07:52 limoshka systemd[1]: Stopped OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Start request repeated too quickly.
мар 29 21:07:52 limoshka systemd[1]: Failed to start OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Unit entered failed state.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Failed with result 'exit-code'.

# journalctl -xe

--
-- Начат процесс запуска юнита opendkim.service.
мар 29 21:07:52 limoshka opendkim[1253]: "X-Header" deprecated; use "SoftwareHeader" instead
мар 29 21:07:52 limoshka opendkim[1253]: opendkim: milter socket must be specified
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Control process exited, code=exited status=78
мар 29 21:07:52 limoshka systemd[1]: Failed to start OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
-- Subject: Ошибка юнита opendkim.service
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Произошел сбой юнита opendkim.service.
--
-- Результат: failed.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Unit entered failed state.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Failed with result 'exit-code'.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Service hold-off time over, scheduling restart.
мар 29 21:07:52 limoshka systemd[1]: Stopped OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
-- Subject: Завершена остановка юнита opendkim.service.
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Процесс остановки юнита opendkim.service был завершен.
мар 29 21:07:52 limoshka systemd[1]: Starting OpenDKIM DomainKeys Identified Mail (DKIM) Milter...
-- Subject: Начинается запуск юнита opendkim.service
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Начат процесс запуска юнита opendkim.service.
мар 29 21:07:52 limoshka opendkim[1255]: "X-Header" deprecated; use "SoftwareHeader" instead
мар 29 21:07:52 limoshka opendkim[1255]: opendkim: milter socket must be specified
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Control process exited, code=exited status=78
мар 29 21:07:52 limoshka systemd[1]: Failed to start OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
-- Subject: Ошибка юнита opendkim.service
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Произошел сбой юнита opendkim.service.
--
-- Результат: failed.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Unit entered failed state.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Failed with result 'exit-code'.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Service hold-off time over, scheduling restart.
мар 29 21:07:52 limoshka systemd[1]: Stopped OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
-- Subject: Завершена остановка юнита opendkim.service.
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Процесс остановки юнита opendkim.service был завершен.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Start request repeated too quickly.
мар 29 21:07:52 limoshka systemd[1]: Failed to start OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
-- Subject: Ошибка юнита opendkim.service
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Произошел сбой юнита opendkim.service.
--
-- Результат: failed.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Unit entered failed state.
мар 29 21:07:52 limoshka systemd[1]: opendkim.service: Failed with result 'exit-code'.