python--发多张图片邮件

#相关库
from email.mime.base import MIMEBase
from email import encoders
from email.mime.multipart import MIMEMultipart
from email.header import Header
from email.mime.text import MIMEText
import smtplib,os

from_addr = '******'
password = '******'
to_addr = '*******'
# 发信服务器
smtp_server = '。。。。'
msg = MIMEMultipart()
# 邮件头信息
msg['From'] = Header(from_addr)
msg['To'] = Header(to_addr)
msg['Subject'] = Header('邮件测试')
# 取出文件夹中所有文件
allfilelist = os.listdir('.//images//feedBack')
#可以在content中添加一些文字说明
content = '<br><br>'
for index in range(len(allfilelist)):
     #
    content += '<img src="cid:' + str(index) + '" align="center" width=60%><br>'
msg.attach(MIMEText(content, 'html', 'utf-8'))
index = 0
for file in allfilelist:
    #判断是否为文件
    if os.path.isfile(f'.//images//feedBack//{file}'):
        with open(f'.//images//feedBack//{file}', 'rb') as f:
            mime = MIMEBase('image', 'png', filename=file)
            mime.set_payload(f.read())
            mime.add_header('Content-ID', '<' + str(index) + '>')
            encoders.encode_base64(mime)
            index += 1
            msg.attach(mime)
            f.close()
try:
    server = smtplib.SMTP_SSL(smtp_server)
    server.connect(smtp_server, 465)
    server.login(from_addr, password)
    # 发送邮件
    server.sendmail(from_addr, to_addr, msg.as_string())
    # 关闭服务器
    server.quit()
except:
    print("发送失败")