#!/usr/bin/perl

my $N = $ARGV[0] || 0;

use Mail::IMAPClient;
use strict;

my ($host, $id, $pass) = qw( YOURMAIL.HOSt.COM YOURNAME YOURPW );

my $imap = Mail::IMAPClient->new(
  Server => $host,
  User    => $id,
  Password=> $pass,
) or die "Cannot connect to $host as $id: $@";

my $ct = 0;
my @allMsgs;
foreach my $folder ( $imap->folders ){
  $imap->select($folder);
  $imap->Peek(1);
  my @msgs = grep $_, $imap->unseen();
  next unless scalar @msgs;
  push @allMsgs, { folder => $folder, msgs => \@msgs };
  $ct += scalar (@msgs);
}
foreach my $h (@allMsgs){
  my $folder = $h->{folder};
  my @msgs = @{$h->{msgs}};
  $imap->select($folder);
  $imap->Peek(1);
  foreach my $msgId ( reverse @msgs ){
    printf "%-2d [%s] %s\n", $ct, $folder, $imap->subject($msgId) unless $N && $ct != $N;
    printf "=====> %s\n%s", $imap->get_header($msgId, 'From'), $imap->body_string($msgId) if $ct == $N;
    $ct--;
  }
}