use strict;
use Net::IMAP::Simple;
use Number::Format;

my $fmt = new Number::Format;

# Create the object
my $imap = Net::IMAP::Simple->new('yourisp') ||
  die "Unable to connect to IMAP: $Net::IMAP::Simple::errstr\n";

# Log on
if(!$imap->login('loluser', 'secretpassword')){
   print STDERR "Login failed: " . $imap->errstr . "\n";
   exit(64);
}

# Print the subject's of all the messages in the INBOX
my $nm = $imap->select('INBOX');

my $total = 0;
for my $i ( 1 .. $nm ) {
    my $size = $imap->list($i);

    print "", ($imap->seen($i) ? "* " : "  "), $fmt->format_bytes($size, 1), " bytes\n";

    $total += $size;
}

$imap->quit;

print "\n total = ", $fmt->format_bytes($total, 1), " bytes\n";