[Unit]
Description=Exim MTA (socket activated)
Documentation=man:exim
Documentation=https://exim.org/docs.html

[Service]
Environment=INACTIVITY_TIMEOUT=5m
ExecStart=exim -bw${INACTIVITY_TIMEOUT}
StandardInput=socket
StandardError=journal

ProtectSystem=strict
ReadWriteDirectories=/var/spool/exim
ReadWriteDirectories=/var/log/exim

Slice=exim.slice