Nice job, imho, but allow me two random remarks:

• This line is useless:

  my $recipient = "root";
  unless (defined($recipient)) { $recipient = "root" } # useless
  [download]

  and I would - if it wasn't useless - prefer to write the line as $recipient = "root" unless (defined($recipient)); but that's more a matter of taste...
• These lines can be simplified:

  substr($message{detail}, 32, 8) =~ /(\w\w)(\w\w)(\w\w)(\w\w)/;
  $message{mml} = pack ("CCCC", hex($1), hex($2), hex($3), hex($4));
  
  # simply
  $message{mml} = pack ("H*", substr($message{detail}, 32, 8));
  [download]

-- Hofmator

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