I am trying to create a script where the user gets an email (column 1) with the body being column 2. However, after that, I want to replace the "@" in the email with a "#" so that they do not get the email again. 

I know that I could have the script use the last active row, however, I cannot do that because I have formulas in the remaining rows so it thinks it is active.

Here's what I have:

```
function sendEmails() {
  var sheet = SpreadsheetApp.getActiveSheet();
  var startRow = 2;  // First row of data to process
  var numRows = 2000;   // Number of rows to process
  // Fetch the range of cells A2:B3
  var dataRange = sheet.getRange(startRow, 1, numRows, 2)
  // Fetch values for each row in the Range.
  var data = dataRange.getValues();
  for (i in data) {
    var row = data[i];
    var emailAddress = row[0];  // First column
    var message = row[1];       // Second column
    var subject = "Quiz Results";
    MailApp.sendEmail(emailAddress, subject, message);
  }
}

```