[Unit] Description=Exim Mail Transport Agent After=network.target Conflicts=sendmail.service postfix.service [Service] PrivateTmp=true Environment=QUEUE=1h EnvironmentFile=-/etc/sysconfig/exim ExecStartPre=-/usr/libexec/exim-gen-cert ExecStart=/usr/sbin/exim -bd -q${QUEUE} [Install] WantedBy=multi-user.target