This simple code snippet can be included in a Google Docs spreadsheet script editor to extract header information from email.

gistfile1.js

function processInbox() {
  
  sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  
  // get all threads with the label draft > replave with the lable you need
  searchString = "label:draft";
  var threads = GmailApp.search(searchString);
  for (var i = 0; i < threads.length; i++) {
    // get all messages in a given thread
    var messages = threads[i].getMessages();
    // iterate over each message
    for (var j = 0; j < messages.length; j++) {
      var data = [];
      data[0] = new Array();
      data[0][0] = messages[j].getFrom();
      data[0][1] = messages[j].getTo();
      data[0][2] = messages[j].getCc();
      data[0][3] = messages[j].getBcc();
      data[0][4] = messages[j].getSubject();
      data[0][5] = messages[j].getDate();
      var attachments = messages[j].getAttachments();
      // number of attachments
      data[0][6] = attachments.length;
      var attachmentList = ""
      for (var k = 0; k < attachments.length; k++) {
        attachmentList += attachments[k].getName() + ", ";
      }
      // name of attachments if any
      data[0][7] = attachmentList;
      // this link will allow you to open the mail thread from the spreadsheet to see the attachments.
      data[0][8] = threads[i].getPermalink();
      // update spreasheet
      sheet.getRange(sheet.getLastRow()+1, 1, 1, 9).setValues(data);
    }
  }
};