Extract emails from google apps account

function extractEmailAddresses() {   
  var ss = SpreadsheetApp.getActiveSpreadsheet();   
  var sheet = ss.getSheets()[0];

  var search = "in:spam is:all ";  

  var threads = GmailApp.search(search);      
  var row, messages, from, email;
  
  try {    
    for (var x=0; x<threads.length; x++) {          
      from = threads[x].getMessages()[0].getFrom();
      from = from.match(/\S+@\S+\.\S+/g);   
      
      if ( from.length ) {                  
        email = from[0];
        email = email.replace(">", "");
        email = email.replace("<", "");
        
        row   = sheet.getLastRow() + 1;                
        sheet.getRange(row,1).setValue(email);
      }
    }
  } catch (e) {
    Logger.log(e.toString());
    Utilities.sleep(5000);
  }
}

// Remove Duplicate Email addresses
function cleanList() {
  var sheet = SpreadsheetApp.getActiveSheet();
  var data = sheet.getRange(4, 1, sheet.getLastRow()).getValues();
  var newData = new Array();
  for(i in data){
    var row = data[i];
    var duplicate = false;
    for(j in newData){
      if(row[0] == newData[j][0]){
        duplicate = true;
      }
    }
    if(!duplicate){
      newData.push(row);
    }
  }

  sheet.getRange(4, 2, newData.length, newData[0].length).setValues(newData);
}