使用Python email模块发送邮件时附件显示为noname的问题排查

问题出在你把附件的文件名头加到了外层的邮件容器对象上，而非附件本身：

你当前代码中是给MIMEMultipart对象（email变量）添加Content-Disposition头，但邮件客户端只会读取附件对应的MIMEBase对象的头信息来识别文件名，外层的头不会被解析为附件的文件名。

修正后的代码 #

import smtplib

from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email import encoders

# Setup email log message
logfile = "log.txt"
sender = "xxxxx@gmail.com"
password = "xxxxx"
receiver = "xxxxx@gmail.com"
subject = "Log file ALERT!"
body = """
Hello Dave,
Here is your log file.
"""

email = MIMEMultipart()
email["From"] = sender
email["To"] = receiver
email["Subject"] = subject

email.attach(MIMEText(body, "plain"))
attachment = "logkeys.txt"
attached_file = open(attachment, 'rb')
payload = MIMEBase('application', 'octet-stream')
payload.set_payload((attached_file).read())
encoders.encode_base64(payload)
# 关键修改：把Content-Disposition头添加到payload（附件对象）上，而非外层email对象
payload.add_header('Content-Disposition', 'attachment', filename=attachment)
email.attach(payload)

session = smtplib.SMTP_SSL('smtp.gmail.com', 465) #use gmail with port
session.login(sender, password) #login with mail_id and password
session.sendmail(sender, receiver, email.as_string())
session.quit()

说明 #

将email.add_header(...)替换为payload.add_header(...)后，代表附件的MIMEBase对象会携带正确的文件名标识头，邮件客户端就能正确识别并显示附件名称logkeys.txt，而不是默认的'noname'。

内容的提问来源于stack exchange，提问作者pentestdave