Google Apps Script でGmailの受信ボックスを参照する

function getMail(){
    var thds = GmailApp.getInboxThreads();
    var row = 1;
    for(var n in thds){
        var thd = thds[n];
        var msgs = thd.getMessages();
        for(m in msgs){
            var msg = msgs[m];
            var from = msg.getFrom();
            var to = msg.getTo();
            var date = msg.getDate();
            var subject = msg.getSubject();
            var body = msg.getBody();
            row++;
        }
    }
}