python使用smtp在邮件中嵌入图片

import smtplib
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.header import Header


sender = 'xxx@xx.com'
password = 'xxxxx'

receiver = {'x@xx.com', }

#采用related定义内嵌资源的邮件体
message = MIMEMultipart('related')

message['From'] = Header(sender, 'utf-8')
message['To'] = Header('邮件', 'utf-8')
message['Subject'] = 'Python SMTP 发送的带图片的邮件'
msg_content = MIMEMultipart('alternative')
mail_msg = """
<p>使用python发送邮件</p>
<br>
<p>
图片
<img src="cid:img1">
</p>
"""
msg_content.attach(MIMEText(mail_msg, 'html', 'utf-8'))
message.attach(msg_content)
with open('test.jpg', 'rb') as f:
    img1 = MIMEImage(f.read())

img1.add_header('Content-ID', 'img1')
message.attach(img1)
try:
    smtp = smtplib.SMTP_SSL('smtp.qiye.aliyun.com', 465)
    smtp.login(sender, password)
    smtp.sendmail(sender, receiver, message.as_string())
    print('邮件已发送！')
except smtplib.SMTPException as e:
    print('出现错误！', e.args[1].decode('gbk'))