在學習Scrapy發送Email時遇到以下錯誤：

[scrapy.mail] ERROR: Unable to send mail: To=['mymail@gmail.com'] Cc=[] Subject="news" Attachs=1- 502 Server does not support secure communication via TLS / SSL

我也剛學Scrapy沒多久，程式碼部分是參考教學的，功能是Email攜帶附件CSV檔案傳送。

 def close_spider(self, spider):
        self.exporter.finish_exporting()
        self.file.close()

        mail = MailSender(
            smtphost=settings.MAIL_HOST,
            smtpport=settings.MAIL_PORT,
            smtpuser=settings.MAIL_FROM,
            smtppass=settings.MAIL_PASS,
            smtptls=settings.MAIL_TLS,
        )
        attach_name = "posts.csv"
        mime_type = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
        file_object = open("posts.csv", "rb")

        return mail.send(
            to=["mymail"],
            subject="news",
            body="",
            attachs=[(attach_name, mime_type, file_object)]
        )

setting部分如下

MAIL_HOST = "smtp.gmail.com"
MAIL_PORT = 587
MAIL_FROM = "mymail"
MAIL_PASS = "**********"
MAIL_TLS = True

看錯誤訊息應該和TLS連線有關，上網爬文後還是找不到解答，請問有人可以告訴我哪裡出錯嗎?
或有任何的指教都很歡迎~

我的環境是Python 3.8.8 / Scrapy 2.5.0