gentoo-overlay/mail-filter/postgrey/files/postgrey.service

[Unit]
Description=Postfix Greylisting Service
Before=postfix.service

[Service]
Type=simple
ExecStart=/usr/sbin/postgrey --inet=127.0.0.1:10030 \
	--pidfile=/var/run/postgrey.pid \
	--group=postgrey --user=postgrey \
	--greylist-text="Greylisted for %%s seconds"
Restart=always
RestartSec=5
TimeoutSec=10

[Install]
WantedBy=multi-user.target