Python：发送多部分 html 电子邮件，同时包含嵌入图像和附件

Question

查了很多帖子，还是没找到解决办法。我可以发送带有嵌入图片的电子邮件，但电子邮件还包含这些图片作为附件，我只需要嵌入图片。我尝试了很多变体，'related' 类型，'mixed'。在 Python 程序中也有 html 代码（不在 Jinja2 模板中），但我无法让它工作。

list_of_images = get_graphs() #list with file names

# here if I put "related" - images are sent ONLY as attachments 
mail = MIMEMultipart() 
for filename in list_of_images:
    fp = open(filename, 'rb')
    msg_img = MIMEImage(fp.read())
    fp.close()
    msg_img.add_header('Content-ID', '<{}>'.format(filename))
    msg_img.add_header('Content-Disposition', 'inline', filename=filename)
    mail.attach(msg_img)
#Jinja2 for html template
env = Environment(loader=FileSystemLoader('.'))
main = env.get_template('images.tpl')
html = main.render(pictures=list_of_images)
msgHtml = MIMEText(html, 'html')
mail.attach(msgHtml)

mail['Subject'] = "TEST"
mail['From'] = "email@addr"
mail['To'] = "email@addr"
s = smtplib.SMTP("localhost")
s.sendmail(mail['From'], "email@addr", mail.as_string())
s.quit()

jinja 模板：

<html>
<body>
{% for image in pictures %}
<img src="cid:{{image}}">
{% endfor %}
</body>
</html>

Answer 1

首先附加 HTML 或为 multipart/related 内容类型指定一个“开始”参数。

引用 RFC2387:

The start parameter, if given, is the content-ID of the compound object's "root". If not present the "root" is the first body part in the Multipart/Related entity. The "root" is the element the applications processes first.

因此，在您的示例中，您可以进行这些更改以标记根元素：

mail = MIMEMultipart("related", start="<HTML>", type="text/html") 
...
msgHtml.add_header('Content-ID', '<HTML>')

至少在 Google 邮件中，首先放置 HTML 或添加“开始”参数可以让图像内联显示。

完整示例：

from jinja2 import Template
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.image import MIMEImage
from glob import glob
from getpass import getpass
import smtplib

me = 'example@gmail.com'
you= 'example@gmail.com'
auth = ('example@gmail.com', getpass())
mx=  ('smtp.gmail.com', 465)

list_of_images = glob('*.jpg')

mail = MIMEMultipart("related")
#Jinja2 for html template
main = Template('''
    <html><body>
    {% for image in pictures %}<img src="cid:{{image}}">{% endfor %}
    </body></html>''')
html = main.render(pictures=list_of_images)
msgHtml = MIMEText(html, 'html')
mail.attach(msgHtml)

for filename in list_of_images:
    fp = open(filename, 'rb')
    msg_img = MIMEImage(fp.read())
    fp.close()
    msg_img.add_header('Content-ID', '<{}>'.format(filename))
    msg_img.add_header('Content-Disposition', 'inline', filename=filename)
    mail.attach(msg_img)

mail['Subject'] = "TEST"
mail['From'] = me
mail['To'] = you

s = smtplib.SMTP_SSL(*mx)
s.login(*auth)
s.sendmail(me, you, mail.as_string())
s.quit()

Python：发送多部分 html 电子邮件，同时包含嵌入图像和附件

Python: Multipart html email is sent both with embedded image and attachment

html

python

email

mime

jinja2