Python3使用smtp发邮件

示例中使用的阿里邮箱

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

# 第三方 SMTP 服务
mail_host = "smtp.mxhichina.com"  # SMTP服务器
mail_user = "home@localnetwork.cn"  # 用户名
mail_pass = "12345678"  # 授权密码

sender = 'home@localnetwork.cn'    # 发件人邮箱(最好写全, 不然会失败)
receivers = ['18900000000@189.cn', '123@123.com']  # 接收邮件，可设置为你的QQ邮箱或者其他邮箱

content = '我用Python'  # 邮件正文
title = '人生苦短'  # 邮件主题

def sendEmail():
    message = MIMEText(content, 'plain', 'utf-8')  # 内容, 格式, 编码
    message['From'] = "{}".format(sender)
    message['To'] = ",".join(receivers)
    print(message['TO'])
    message['Subject'] = title

try:
        smtpObj = smtplib.SMTP_SSL(mail_host, 465)  # 启用SSL发信, 端口一般是465
        smtpObj.login(mail_user, mail_pass)  # 登录验证
        smtpObj.sendmail(sender, receivers, message.as_string())  # 发送
        print("mail has been send successfully邮件已成功发送.")
    except smtplib.SMTPException as e:
        print(e)

if __name__ == '__main__':
    sendEmail()