AWS LambdaでGmailの送信

sendmail.py

#coding: UTF-8
import os
import smtplib
from email.mime.text import MIMEText

# Gmailアカウント
FROM_ADDR = os.environ['mail_from_addr']
# アプリパスワード
PASSWD = os.environ['mail_passwd']
# 送信先メールアドレス
TO_ADDR = os.environ['mail_to_addr']

def lambda_handler(event, context):
    # メールタイトル
    title_text = 'Mail Title'
    # メール本文
    body_text = 'Mail Body Message.'
    msg = MIMEText(body_text)
    msg['Subject'] = title_text
    msg['From'] = FROM_ADDR
    msg['To'] = TO_ADDR
    s  = smtplib.SMTP('smtp.gmail.com', 587)
    s.ehlo()
    s.starttls()
    s.login(FROM_ADDR, PASSWD)
    s.sendmail(FROM_ADDR, TO_ADDR, msg.as_string())
    s.close()