I didn't notice it was a string, thanks. So it could be done like this, though toolic's answer is cleaner. 
my $attached = $code ? { attach_path => $file_name, attach_filename =>
+ $file_name, attach_type => 'application/txt' } : {};

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In reply to Re^3: Odd number of elements in anonymous hash by tangent
in thread Odd number of elements in anonymous hash by Anonymous Monk

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