call columns by their headers

callHeadersByName.gs

function callColumnsByHeaders() {
  var ss=SpreadsheetApp.getActive();
  var sh=ss.getActiveSheet();
  var rg=sh.getDataRange();
  var vA=rg.getValues();
  var hA=vA[0];  //header row
  
  for(var i=1;i<vA.length;i++)
  {
    var row=[];
    for(var j=0;j<vA[0].length;j++)
    {
      row[hA[j]]=vA[i][j];
    }
    Logger.log('Email:%s Subject: %s Message: %s',row.Email,row.Subject,row.Message);
  }

}