[Unit]
Description=Zone Mail Transport Agent
Conflicts=sendmail.service exim.service postfix.service
After=network.target

[Service]
Environment="NODE_ENV=production"
# replace with your actual working directory
WorkingDirectory=/opt/zone-mta
ExecStart=/usr/bin/node --max-old-space-size=2048 app.js
ExecReload=/bin/kill -HUP $MAINPID
SyslogIdentifier=zone-mta
Type=simple
Restart=always

[Install]
WantedBy=multi-user.target