var SEARCH_QUERY = 'label:Inbox is:unread from:cotizar@todo.com.ar     subject:Formulario ';

// Credit: https://gist.github.com/oshliaer/70e04a67f1f5fd96a708

function getEmails_(q) {
    var emails = [];
    var threads = GmailApp.search(q);
    for (var i in threads) {
        var msgs = threads[i].getMessages();
        for (var j in msgs) {
            emails.push([msgs[j].getBody().replace(/<.*?>/g,' ','/')
            ]);
        }
}
return emails;
}
function appendData_(sheet, array2d) {
    sheet.getRange(sheet.getLastRow() + 1, 1, array2d.length,     array2d[0].length).setValues(array2d);
}
function run(){
  var array2d = getEmails_(SEARCH_QUERY);
  if (array2d) {
    var ss = SpreadsheetApp.openById("1c52lPT8oEu-lPloYu_n-    apCWiTQgeYP7Wz9cdK2I3w");
    Logger.log(ss.getName());
    var sheet =     SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Potenciales');
    if (sheet != null) {
    Logger.log(sheet.getIndex());
        appendData_(SpreadsheetApp.getActiveSheet(), array2d);
    }
  markArchivedAsRead ();
    }
    function markArchivedAsRead() {
      var threads = GmailApp.search('label:Inbox is:unread         from:cotizar@todo.com.ar subject:Formulario ');
      GmailApp.markThreadsRead(threads);
  }
 }

function getEmails_(q) {
    var emails = [];
    var threads = GmailApp.search(q);
    var messages = threads[0].getMessages();

    for (var i = 0; i < messages.length; i++) {
        /*Solamente si es no leído lo incluimos en el array*/
        if(messages[i].isUnread()){
          emails.push([messages[i].getSubject()]);
        }
    }
    return emails;
}