return_address = render letter.return_address
return_address[:name] = letter.return_address_name_line
{
  id: letter.public_id,
  sender: letter.user.public_id,
  status: letter.aasm_state,
  tags: letter.tags,
  return_address:,
  address: render(letter.address),
  label_url: pii { if_expand(:label) { rails_blob_url(letter.label) if letter.label.attached? } },
  rubber_stamps: letter.rubber_stamps,
  metadata: letter.metadata || {},
}.compact_blank
