root@vcsa [ /etc/mail ]# systemctl status sendmail
? sendmail.service - Sendmail Mail Transport Agent
Loaded: loaded (/etc/systemd/system/sendmail.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2017-12-28 14:46:52 EET; 7min ago
Process: 40811 ExecStart=/usr/sbin/sendmail -bd -q $QUEUE $SENDMAIL_OPTARG (code=exited, status=0/SUCCESS)
Main PID: 40813 (code=exited, status=71)
Dec 28 14:46:42 vcsa sendmail[40813]: NOQUEUE: --- 451 4.0.0 opendaemonsocket: daemon Daemon1: cannot bind: Address already in use (hold)
Dec 28 14:46:42 vcsa sendmail[40813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon Daemon1: cannot bind: Address already in use
Dec 28 14:46:42 vcsa sendmail[40813]: daemon Daemon1: problem creating SMTP socket
Dec 28 14:46:47 vcsa sendmail[40813]: NOQUEUE: --- 451 4.0.0 opendaemonsocket: daemon Daemon1: cannot bind: Address already in use (hold)
Dec 28 14:46:47 vcsa sendmail[40813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon Daemon1: cannot bind: Address already in use
Dec 28 14:46:47 vcsa sendmail[40813]: daemon Daemon1: problem creating SMTP socket
Dec 28 14:46:52 vcsa systemd[1]: sendmail.service: Main process exited, code=exited, status=71/n/a
Dec 28 14:46:52 vcsa systemd[1]: Stopped Sendmail Mail Transport Agent.
Dec 28 14:46:52 vcsa systemd[1]: sendmail.service: Unit entered failed state.
Dec 28 14:46:52 vcsa systemd[1]: sendmail.service: Failed with result 'exit-code'.