Python3使用smtp发邮件（带附件）

示例中使用的阿里邮箱，替换附件文件需修改`attach_file = "log2021-09-28.txt"`

```python
import smtplib
from email.header import Header
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
# 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 = MIMEMultipart()  # 有附件时用这个
    part1 = 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

message.attach(part1)  ##将内容附加到邮件主体中

#添加附件
    attach_file = "log2021-09-28.txt"
    if attach_file:
        att1 = MIMEText(open(attach_file, 'rb').read(), 'base64', 'utf-8')
        att1['Content-Type'] = 'application/octet-stream'
        att1['Content-Disposition'] = 'attachment; filename={}'.format(attach_file)
        message.attach(att1)  ##将内容附加到邮件主体中

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()
```

参考：[python3发送邮件（有附件）](https://www.cnblogs.com/sammy1989/p/6137928.html "python3发送邮件（有附件）")  |  [python3发送邮件有附件示例](https://www.cnblogs.com/sea-stream/p/14181564.html "python3发送邮件（有附件）")