Python 2.7测试是否发送了SMPT邮件

import smtplib
from email.mime.text import MIMEText

def send_smtp_email(sender, receiver, subject, message):
    # 创建MIMEText对象
    msg = MIMEText(message)

    # 设置发件人、收件人和主题
    msg['From'] = sender
    msg['To'] = receiver
    msg['Subject'] = subject

    # 连接SMTP服务器
    smtp_server = smtplib.SMTP('smtp.example.com', 587)  # 替换为实际的SMTP服务器和端口号
    smtp_server.starttls()  # 启用TLS加密
    smtp_server.login('username', 'password')  # 替换为实际的用户名和密码

    # 发送邮件
    smtp_server.sendmail(sender, receiver, msg.as_string())

    # 关闭连接
    smtp_server.quit()

send_smtp_email('sender@example.com', 'receiver@example.com', 'Test Email', 'This is a test email.')