Thunderbird "size unknown" 附件与 python 一起发送

Question

当我使用下面的python代码发送带附件的邮件时，虽然可以下载附件，但附件旁边会显示大小未知，如果我转发该邮件，附件不在转发电子邮件，这似乎是 Thunderbird（60.5.2（32 位））特有的问题，但由于我们公司完全使用 TB，因此我需要修复 python 代码以使其兼容结核病

我通过比较在 TB 中发送的电子邮件附件的来源来使用 TB 中 "view source" 来源的原始字符串，但无济于事。

PS: 在 mozilla 中找到相关的 bug tracker 以供参考: https://bugzilla.mozilla.org/show_bug.cgi?id=548507

import os
import smtplib

from email.header import Header
from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication
from email.mime.text import MIMEText
from email.utils import formataddr
from email.utils import parseaddr

sender = "from@gmail.com"
to_address = ["to@gmail.com"]
subject = "Test subject"
body = "Test body"
title = "title"

attach_files = ['c:\dummy.pdf']

host = 'localhost.com'
user = 'user@mail.com'
password = 'password'

msg_root = MIMEMultipart('related')
addr = '{} <{}>'.format(title, sender)
name, address = parseaddr(addr)
msg_root['From'] = formataddr((
    Header(name, 'utf-8').encode(),
    address .encode('utf-8') if isinstance(address , unicode) else address))

msg_root['To'] = ','.join(to_address)
msg_root['Subject'] = Header(subject, 'utf-8')
msg_text = MIMEText(body, 'html', 'utf-8')
msg_root.attach(msg_text)

for index, attach_file in enumerate(attach_files, start=1):
    with open(attach_file, 'rb') as attach_obj:
        attach = MIMEApplication(attach_obj.read(),
                                 _subtype="pdf",
                                 name=os.path.basename(attach_file))
        attach.add_header('Content-Disposition', 'attachment',
                          filename=os.path.basename(attach_file))
        msg_root.attach(attach)

connection = smtplib.SMTP_SSL(host=host, timeout=5)
try:
    connection.login(user=user, password=password)
    connection.sendmail(user, all_address, msg_root.as_string())
finally:
    connection.quit()

我可以接受任何答案，只要：转发通过 Python 发送的带有附件的电子邮件时，该电子邮件的附件仍包含在 TB（最新版本 60+）中。

预期结果：附件旁边有文件大小，转发附件邮件也会包含附件。

Answer 1

使用'mixed'代替'related'

msg_root = MIMEMultipart('mixed')

您会在附件旁边看到尺寸，附件将被转发。

测试于 TB 60.7.2 (64-bit) / Linux Mint 19.1

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