gentoo-overlay/net-mail/fetchmail/files/fetchmail_at.service

[Unit]
Description=A remote-mail retrieval utility for %i
After=network.target

[Service]
User=fetchmail
ExecStart=/usr/bin/fetchmail --pidfile %t/fetchmail/fetchmail-%i.pid -i /var/lib/fetchmail/.fetchids.%i -f /etc/fetchmailrc-%i -d 60
RestartSec=1

[Install]
WantedBy=multi-user.target