root@qmailhost:~# cat /etc/systemd/system/qmail-start.service
[Unit]
After=network.target
[Service]
Environment="PATH=/var/qmail/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
ExecStart=/var/qmail/bin/qmail-start ./Maildir/ splogger qmail
Restart=on-failure

[Install]
WantedBy=multi-user.target

root@qmailhost:~# cat /etc/systemd/system/qmail-smtpd.service
[Unit]
After=network.target
[Service]
ExecStart=/usr/local/bin/tcpserver -v -u 1003 -g 50003 -x /etc/tcp.smtp.cdb  0 smtp /var/qmail/bin/qmail-smtpd 2>&1 | /var/qmail/bin/splogger smtpd 3
Restart=on-failure

[Install]
WantedBy=multi-user.target