SMTP is configured via the web interface. Navigate to Settings → Configure and work through the setup wizard until you get to the SMTP settings.
Create a .env file if one doesn't already exist
sudo -u lubelogger touch /opt/lubelogger/.envUse the following config
MailConfig__EmailServer="smtp.example.com"
MailConfig__EmailFrom="lubelogger@example.com"
MailConfig__Port=587
MailConfig__Username="lubelogger@example.com"
MailConfig__Password="****************"Restart the LL systemd service
systemctl restart lubelogger.service