[Unit]
Description=SerialMail Server
After=network.target
Wants=network-online.target

[Service]
DynamicUser=yes
User=serialmail
Group=serialmail
EnvironmentFile=/etc/serialmail.conf
ExecStart=/usr/bin/serialmail -addr $ADDR -login-key $LOGIN_KEY $IMAP_SERVER $SMTP_SERVER
Restart=on-failure

[Install]
WantedBy=multi-user.target