Content-Type: text/plain; charset=ISO-8859-1; format=flowed

##</code><code>##

sub send_message{
    $msg = MIME::Lite->new( 
                From     => 'someone@somewhere.com',
                BCc      => "$_",
                Subject  => 'Subject',
                Encoding => '7bit',
                Type     => 'text/plain',
                Data     => "$message"
                );
$msg->attr("content-type"         => "text/plain");
$msg->attr("content-type.charset" => "ISO-8859-1");
$msg->attr("content-type.name"    => "flowed");

$msg->send;
}

##</code><code>##

Content-Type: text/plain; charset="ISO-8859-1"; name="flowed"