无法通过Python发送电子邮件

import smtplib
from email.mime.text import MIMEText

def send_email():
    # 邮件服务器配置
    smtp_server = 'smtp.exmail.qq.com'
    smtp_port = 465
    sender = 'sender@example.com'
    password = 'password'
    receiver = 'receiver@example.com'

    # 构建邮件消息
    message = MIMEText('This is the content of the email', 'plain', 'utf-8')
    message['From'] = sender
    message['To'] = receiver
    message['Subject'] = 'Test Email'

    try:
        # 连接到SMTP服务器
        smtp_obj = smtplib.SMTP_SSL(smtp_server, smtp_port)
        # 登录到SMTP服务器
        smtp_obj.login(sender, password)
        # 发送邮件消息
        smtp_obj.sendmail(sender, receiver, message.as_string())
        print('Email sent successfully')
    except smtplib.SMTPException as e:
        print('Failed to send email:', str(e))
    finally:
        # 断开与SMTP服务器的连接
        smtp_obj.quit()

send_email()