Python将内联图像添加到多部分/替代电子邮件

Posted 2023-02-23

【中文标题】Python将内联图像添加到多部分/替代电子邮件

【英文标题】：Python Add Inline Images to multipart/alternative emails

【发布时间】：2020-06-16 05:53:38

【问题描述】：

将内联附件添加到电子邮件正文时，它们不会与下面的代码一起显示。

from email.message import EmailMessage
from email.mime.image import MIMEImage
msg = EmailMessage()
msg["From"] = "[e-mail]"
msg["To"] = "[e-mail]"
msg["Subject"] = "Test Email"
plain_text, html_message =  # Plain Text and HTML email content created
msg.set_content(plain_text)
msg.add_alternative(html_message, subtype='html')

# adding the inline image to the email
with open('logo.png', 'rb') as img:
    logo = MIMEImage(img.read())
    logo.add_header('Content-ID', f'<connect_logo_purple>')
    logo.add_header('X-Attachment-Id', 'connect_logo_purple.png')
    logo['Content-Disposition'] = f'inline; filename=connect_logo_purple.png'
    msg.attach(logo)

但是在add_attachment之后添加内联附件时会显示。

# ... Create message like above
msg.set_content(plain_text)
msg.add_alternative(html_message, subtype='html')

# Only when an attachment is added does the inline images show up
msg.add_attachment(
    #..details filled in
)

# .. continue with inline image
with open('logo.png', 'rb') as img:
    logo = MIMEImage(img.read())
    logo.add_header('Content-ID', f'<connect_logo_purple>')
    logo.add_header('X-Attachment-Id', 'connect_logo_purple.png')
    logo['Content-Disposition'] = f'inline; filename=connect_logo_purple.png'
    msg.attach(logo)

【参考方案1】：

我发现当调用add_attachment 命令时，它会将电子邮件的payload 更新为multipart/mixed，以便修复它...

# ... Create message like above
msg.set_content(plain_text)
msg.add_alternative(html_message, subtype='html')

# When there isn't a call to add_attachment... 
with open('logo.png', 'rb') as img:
    logo = MIMEImage(img.read())
    logo.add_header('Content-ID', f'<connect_logo_purple>')
    logo.add_header('X-Attachment-Id', 'connect_logo_purple.png')
    logo['Content-Disposition'] = f'inline; filename=connect_logo_purple.png'

    # Make the EmailMessage's payload `mixed`
    msg.get_payload()[1].make_mixed()   # getting the second part because it is the HTML alternative
    msg.get_payload()[1].attach(logo)