Autoresponder for gmail

autoreply.js

/*
 * Auto-replies to all messages marked with a certain label.
 */
function RespondEmail(e) {

  // All messages marked with this label will be auto-replied to
  var autorespondLabel = "autorespond";

  // The message content is pulled from a saved draft email. draftSubject
  // specifies the subject to search for.
  var draftSubject = "Autorespond";

  // The name to reply as
  var replyFrom = '"My Name" <myemail@gmail.com>';


  /**
   * Loads the message from the saved draft with the specified subject.
   *
   * @param {string} - The subject of the draft to retrieve the message from.
   * @return {string} - The message content of the loaded draft.
   */
  var getDraftMessage = (function(draftSubject) {
    var message = "";

    // Cache the message so we only have to search for the draft once
    return function(draftSubject) {
      if (!message) {

        // Loop through all saved drafts
        var drafts = GmailApp.getDrafts();
        for (var i = 0; i < drafts.length; ++i) {
          var draft = GmailApp.getDraft(drafts[i].getId());

          // End search if we've found the subject we're looking for
          if (draft.getMessage().getSubject() == draftSubject) {
            message = draft.getMessage().getBody();
            break;
          }
        }

        if (!message) {
          throw 'Cannot find draft with subject "' + draftSubject + '"';
        }
      }

      return message;
    };
  }());

  // Search for all messages marked with our label
  var autorespond = GmailApp.getUserLabelByName(autorespondLabel);
  var messages = GmailApp.search("label:" + autorespondLabel);

  // Autorespond to all the messages we found. Make sure to remove the
  // autorespond label so the messages aren't picked up next time.
  for (var i = 0; i < messages.length; ++i) {
    var responsebody = getDraftMessage(draftSubject);

    messages[i].removeLabel(autorespond).reply("", {
      htmlBody: responsebody,
      from: replyFrom
    });
  }
}