smtplib不发送电子邮件| Python

import smtplib
from email.mime.text import MIMEText
from email.header import Header

# 邮件服务器的地址和端口号
smtp_server = 'smtp.example.com'
smtp_port = 587

# 发件人和收件人信息
sender = 'sender@example.com'
password = 'password'
receivers = ['receiver1@example.com', 'receiver2@example.com']

# 构造邮件内容
message = MIMEText('这是一封测试邮件', 'plain', 'utf-8')
message['From'] = Header('发件人姓名', 'utf-8')
message['To'] = Header('收件人姓名', 'utf-8')
message['Subject'] = Header('测试邮件', 'utf-8')

try:
    # 连接到SMTP服务器
    smtp_obj = smtplib.SMTP(smtp_server, smtp_port)
    smtp_obj.starttls()  # 启用安全连接
    smtp_obj.login(sender, password)  # 登录到SMTP服务器

    # 发送邮件
    smtp_obj.sendmail(sender, receivers, message.as_string())
    print('邮件发送成功')
except smtplib.SMTPException as e:
    print('邮件发送失败:', e)
finally:
    smtp_obj.quit()  # 断开与SMTP服务器的连接