#!/usr/bin/perl
# REMEMBER THAT YOU NEED TO EDIT THE SUBROUTINE "filter" BEFORE
# DEPLOYING!
use strict;
use Mail::POP3Client;
my %midcache;

my @accounts = (
    {
     USER => "username",
     AUTH_MODE => "PASS",
     PASSWORD => "sekrit!",
     HOST => "pop3.myisp.com"
    },
    # More accounts here.
);

%midcache = map {chomp; $_ => 1} `tail -50 $ENV{HOME}/.msgidcache`;

$|=1;
for (@accounts) {
    print "\nConnecting to $$_{HOST}...";

    my $pop = new Mail::POP3Client (%$_);
    unless ($pop) { warn "Couldn't connect\n"; next; }

    my $count = $pop->Count;
    if ($count <0) { warn "Authorization failed"; next; }
    print "\n";
    print "New messages: $count\n";

    my %down = map {$_ => 1} (1..$count); 
    my @mails;
    for my $num (1..$count) {
        print "\n";
        my @head = $pop->Head($num);
        for (@head) {
             /^(From|Subject):\s+(.*)/i and do {
                print "$1\t$2\n";
                $mails[$num]->{$1} = $2;
             };
             /^Message-Id:\s+(\S+)/i and do {
                if (exists $midcache{$1}) {
                    print "(Duplicate)\n";
                    delete $down{$num};
                    $mails[$num]->{mid} = $1;
                    $pop->Delete($num);
                }
                $midcache{$1}++;
             }
        }
    }

    next unless keys %down;
    my @tocome = sort {$a <=> $b} keys %down;
    print "Downloading: @tocome\n";
    for my $num (@tocome) {
        my @mail;
        print "Downloading message $num (", $mails[$num]->{From}, ":",
        $mails[$num]->{Subject}, ")...";
        @mail = $pop->Retrieve($num);
        $_ .= "\n" for @mail;
        my $now = scalar localtime;
        $mail[0] =~ s/Return-Path:\s+<([^>]+)>/From $1 $now/;
        print "\n";
        if (!@mail) { 
            print "Ugh, something went wrong!\n"; 
            delete $midcache{$mails[$num]->{mid}};
            next;
        }
        filter(@mail);
        $pop->Delete($num);
    }

    $pop->Close;
}

open OUT, ">$ENV{HOME}/.msgidcache" or die $!;
print OUT "$_\n" for keys %midcache;
close OUT;

use Mail::Audit;
use Mail::Send;

sub filter {
my $folder ="$ENV{HOME}/mail/";
my @data = @_;
my $item = Mail::Audit->new(data => \@data, noexit => 1);

#line 90 "a file which you should have edited"
xxx xxx you_have_not_added_your_filter_here_yet
}