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/usr/share/doc/rlinetd/examples/popper is in rlinetd 0.9.1-1.

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service "in.popper" {
  exec "/usr/sbin/in.pop3d";
  instances 20;
  port "pop-3";
  nice 10;
  tcpd;
  log syslog "pop-3 connection from %O:%P";
  user "root";
  # alternatively, if you're daring...
  # user "popper";
  # capability "cap_setuid=eip";
}