为什么我的 Python SMTPLib 电子邮件脚本不起作用，我该如何解决？

问：

因此，我使用Youtube教程编写了一个基本的Python电子邮件脚本。评论说视频很有帮助，但我的代码不起作用。

我的代码如下所示

from email.message import EmailMessage
import ssl
import smtplib

email_sender = '[email protected]'
email_password = "corr ectp assw ords"

email_receiver = '[email protected]'

subject = 'Written by Code!'
body = """
    This was written by my program! Tell me if it worked.
"""

em = EmailMessage()
em['From'] = email_sender
em['To'] = email_receiver
em['Subject']
em.set_content(body)

context = ssl.create_default_context()

with smtplib.SMTP_SSL('smtp.gmail.com', 465, context) as smtp:
    smtp.login(email_sender, email_password)
    smtp.sendmail(email_sender, email_receiver, em.as_string())

错误如下所示：smtplib.SMTPServerDisconnected: Connection unexpectedly closed

有谁知道它为什么失败以及我该如何修复它？谢谢！