use Net::POP3::SSLWrapper;
use strict;
use warnings;

pop3s {
  my $pop = Net::POP3->new('pop.gmail.com', Port => 995) or die "can't make pop3 connection: $!";
  my $nm = $pop->login('foo@gmail.com', 'password');
  my $msgs = $pop->list;

  while (my ($id, $data) = each %$msgs) {
    print "Message ID: $id\n";
    $pop->delete($id);
  }
};

__END__
Here is actual output:

[root@XBASEBK1 popgrabber]# perl jxp.pl 
Messages: 4
Message ID: 4
Message ID: 1
Message ID: 3
Message ID: 2
[root@XBASEBK1 popgrabber]# perl jxp.pl 
Messages: 4
Message ID: 4
Message ID: 1
Message ID: 3
Message ID: 2
[root@XBASEBK1 popgrabber]# perl jxp.pl 
Messages: 4
Message ID: 4
Message ID: 1
Message ID: 3
Message ID: 2