#!/usr/bin/perl -w

our $MAILBOX = './mail/addresses';

use strict;
use Email::Find;
use IO::File;

# Read the mailbox
my $fh = IO::File->new($MAILBOX)
  or die "unable to read mailbox '$MAILBOX': $!";
my $mail;
{
  local $/;
  $mail = <$fh>;
}

# Find addresses
my %addy;
my $finder = Email::Find->new(
  sub {
    my($email, $orig_email) = @_;

    $addy{ $email->address }++;
    return $orig_email;
  }
);
$finder->find(\$mail);

foreach my $address (keys %addy) {
  print "$address $addy{ $address }\n";
}