[Unit]
Description=Sendmail Mail Transport Agent
After=syslog.target network.target
Conflicts=postfix.service exim.service
Wants=sm-client.service
StartLimitIntervalSec=0

[Service]
Type=forking
PIDFile=/run/sendmail.pid
Environment=SENDMAIL_OPTS=-q1h
EnvironmentFile=-/etc/sysconfig/sendmail
ExecStartPre=-/etc/mail/make
ExecStartPre=-/etc/mail/make aliases
ExecStart=/usr/sbin/sendmail -bd $SENDMAIL_OPTS $SENDMAIL_OPTARG
ExecReload=/usr/bin/kill -HUP $MAINPID
# hack to allow async reload to complete, otherwise systemd may signal error
ExecReload=/usr/bin/sleep 2

[Install]
WantedBy=multi-user.target
Also=sm-client.service