多部分电子邮件 PDF 附件空白

Question

谁能指出下面的代码有什么问题吗？

我正在尝试使用 Python 发送一封多部分电子邮件。我可以显示电子邮件正文，但 PDF 显示为空白。

我可以收到一封只有正文的电子邮件，也可以收到一封只有 PDF 的电子邮件，但两者结合在一起是行不通的。

s = smtplib.SMTP('smtp.gmail.com',587)
s.starttls()
s.ehlo
try:
    s.login(gmail, password)
except:
    print 'SMTPAuthenticationError'

fp = file(attachment_path)
pdfAttachment = MIMEApplication(fp.read(), _subtype = "pdf", _encoder=encoders.encode_base64)
pdfAttachment.add_header('content-disposition', 'attachment', filename = ('utf-8', '', basename(attachment_path)))
text = MIMEMultipart('alternative')

t = open(email_body_path).read()
text.attach(MIMEText(t, "plain", _charset="utf-8"))
message = MIMEMultipart('mixed')
message.attach(text)
message.attach(pdfAttachment)
message['Subject'] = 'Test multipart message'

s.sendmail(gmail, 'me@gmail.com', message.as_string())
s.close()

Answer 1

我认为你可能把事情复杂化了。multipart/alternative旨在用于相同数据的不同表示，例如消息的纯文本版本和 HTML 中的相同消息。在您的情况下，您只需创建multipart/mixed并附加文本和 PDF 消息。

from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication

with open(attachment_path) as pdf_file, open(email_body_path) as text_file:
    pdf = MIMEApplication(pdf_file.read(), _subtype = 'pdf')
    pdf.add_header('content-disposition', 'attachment', filename=basename(attachment_path))
    text = MIMEText(text_file.read(), _charset='UTF-8')

msg = MIMEMultipart(_subparts=(text, pdf))
msg['Subject'] = 'Test multipart message'

这将创建一条如下所示的消息：

>>> print msg
From nobody Tue Mar  3 16:35:45 2015
Content-Type: multipart/mixed; boundary="===============4785752000147824692=="
MIME-Version: 1.0
Subject: Test multipart message

--===============4785752000147824692==
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64

VGhpcyBpcyB0aGUgZW1haWwgdGV4dCBib2R5LgpBbmQgdGhlcmUgaXMgYW4gYXR0YWNoZWQgUERG
Lgo=

--===============4785752000147824692==
Content-Type: application/pdf
MIME-Version: 1.0
Content-Transfer-Encoding: base64
content-disposition: attachment; filename="quickref.pdf"

JVBERi0xLjQKJcfsj6IKNiAwIG9iago8PC9MZW5ndGggNyAwIFIvRmlsdGVyIC9GbGF0ZURlY29k
ZT4+CnN0cmVhbQp4nOVbSXMctxW+T+We6xxnkkwb+3KUY9lVTizHFm1XyuUDTUk0o6Eka2Hik/56
.
.
.
--===============4785752000147824692==--