code: def sends(self):
          
          # Expand on each "to" field
          on_to_df = self.expand_on('From', 'To', rename1='From', rename2='Recipient')
          on_cc_df = self.expand_on('From', 'Cc', rename1='From', rename2='Recipient')
  
          # Specify how it was sent
          on_to_df['SendType'] = 'To'
          on_cc_df['SendType'] = 'Cc'
  
          # Combine dataframes
          output_df = pd.concat([on_to_df, on_cc_df])
  
          return self._drop_collections(output_df)
docs: Returns a table of mbox message data, with "sender/recipient" pairs as rows/observations.
  
          .. note::
  
              Rows may have a recipient from either "TO" or "CC". SendType column specifies this for each row.
  
          .. note::
  
              drop_collections is not available for this method, since there are no meaningful collections to keep.
  
          :return: pandas.DataFrame