[Unit]
Description=Postfix Mail Transport Agent in chroot
Conflicts=sendmail.service exim4.service
ConditionPathExists=/chroot/maild/etc/postfix/main.cf

[Service]
Type=oneshot

RootDirectory=/chroot/maild
RootDirectoryStartOnly=no

RemainAfterExit=yes
ExecStart=/bin/true
ExecReload=/bin/true

[Install]
WantedBy=multi-user.target