[Unit]
Description=Start and Stop pymilter-suspicious-from
After=syslog.target network.target

[Service]
ExecStart=/srv/venv/pymilter-suspicious-from/bin/python /srv/repo/pymilter-suspicious-from/main.py 

# Use an unprivileged user here
User=pymilter-suspicious-from

[Install]
WantedBy=multi-user.target