I think $attached should be a hash ref.

use strict;
use warnings;
use Data::Dumper;

my $code = 1;
my $file_name = 'my_file_name';
my $email     = 'to@address.com';
my $from      = 'from@address.com';
my $from_name = 'Me';
my $subject   = 'try_me';
my $body      = 'Here is my message.';

my $attached
    = ($code) ? { attach_path     => $file_name,
                  attach_filename => $file_name,
                  attach_type     => 'application/txt',
                }
    :           {}
    ;

my %args = (
to              => $email,
from            => $from,
from_name       => $from_name,
subject         => $subject,
body            => $body,
%$attached
);

my $success = email(%args);


sub email {
    # Display arguments;
    my %arg_hash = @_;
    print Dumper(\%arg_hash);
    ...
}

OUTPUT:
$VAR1 = {
          'attach_path' => 'my_file_name',
          'from' => 'from@address.com',
          'subject' => 'try_me',
          'from_name' => 'Me',
          'attach_filename' => 'my_file_name',
          'to' => 'to@address.com',
          'attach_type' => 'application/txt',
          'body' => 'Here is my message.'
        };
Unimplemented at C:\Users\Bill\perl\monks\email.pl line 38
[download]

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