[Unit]
Description=exim Mail Transport Agent
Documentation=man:exim(8)
Documentation=https://exim.org/docs.html
Conflicts=sendmail.service postfix.service
After=network-online.target nss-lookup.target
Wants=network-online.target

[Service]
PrivateTmp=true
ProtectSystem=full
# exim needs to access ~/.forward and MDA-files to for local delivery
# ProtectHome=true
PrivateDevices=true
ProtectHostname=true
ProtectClock=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectKernelLogs=true
ProtectControlGroups=true
ProtectProc=invisible
RestrictRealtime=true
PIDFile=/run/exim4/exim.pid
Environment="EXIMSERVICE=-bdf -q30m" "UPEX4OPTS="
EnvironmentFile=-/etc/default/exim4
ExecStartPre=/usr/sbin/update-exim4.conf $UPEX4OPTS
ExecStart=/usr/sbin/exim4 $EXIMSERVICE
ExecReload=kill -HUP $MAINPID
Type=exec

[Install]
WantedBy=multi-user.target