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      push @parts, Email::MIME->create(
          attributes => {
              filename     => $filename,
...
          },
          body => io( $opts->{attach_file} )->binary->all,
      )

      push @parts, Email::MIME->create(
          attributes => {
...
          },
          body => io( $opts->{attach_file} )->binary->all,
      )