[Unit]
Description=Postfix Mail Transport Agent
Documentation=man:postfix(1)
Conflicts=sendmail.service exim4.service
ConditionPathExists=/etc/postfix/main.cf

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/true
ExecReload=/bin/true

[Install]
WantedBy=multi-user.target