[Unit]
Description=Sendmail Mail Transport Inbound Agent for MailScanner
After=syslog.target network.target
Conflicts=postfix.service exim.service sendmail.service sm-client.service
Wants=ms-sendmail.service ms-sendmail-out.service
BindsTo=ms-sendmail.service ms-sendmail-out.service

[Service]
Type=forking
PIDFile=/run/sendmail.in.pid
ExecStart=/usr/sbin/sendmail -bd -OPrivacyOptions=noetrn -ODeliveryMode=queueonly -OQueueDirectory=/var/spool/mqueue.in -OPidFile=/run/sendmail.in.pid

[Install]
WantedBy=multi-user.target
Also=ms-sendmail.service ms-sendmail-out.service