#!/bin/bash

fetch(){
  sleep 1
  echo "USER user@website"
  sleep 1
  echo "PASS mypassword"

  sleep 1
  echo "LIST"

  for i in `seq 1 10`
  do
    sleep 1
    echo "RETR $i"
    sleep 1
    echo "DELE $i"
  done

  sleep 1
  echo "QUIT"
}

fetch |telnet <server> 110