smtp發送電子郵件和爲什麼一個附件可以有兩個Content-Type？

我試圖使用smtp發送帶附件的電子郵件。當我收到原始電子郵件時，有一種附件有兩種內容類型。我怎樣才能得到一種內容類型？這兩種類型相互影響？感謝您的幫助！smtp發送電子郵件和爲什麼一個附件可以有兩個Content-Type？

import smtplib 
from email.mime.multipart import MIMEMultipart 
from email.mime.application import MIMEApplication 

server = smtplib.SMTP() 
server.connect("smtp.XX.com") 

server.login("","") 

msg = MIMEMultipart("") 
msg['From'] = "" 
msg['Subject'] = "titlesub" 
part = MIMEApplication(open("D:\data.txt", 'rb').read()) 
filename="data.txt" 
#part['Content-Type']="application/pdf" 
part.add_header('Content-Type','application/pdf') 
part.add_header('Content-Disposition', 'attachment', filename=filename) 

msg.attach(part) 
msg['To'] = "" 
server.send_message(msg) 
server.quit()

原始電子郵件：

Received: from [127.0.0.1] (unknown [101.81.225.242]) 
by smtp8 (Coremail) with SMTP id DMCowABH3zUeOgBZsU+uAg--.2242S2; 
Wed, 26 Apr 2017 14:11:42 +0800 (CST) 
Content-Type: multipart/; boundary="===============4516509904929376112==" 
MIME-Version: 1.0 
From: 
Subject: titlesub 
To: 
X-CM-TRANSID:DMCowABH3zUeOgBZsU+uAg--.2242S2 
Message-Id:<[email protected]> 
X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73 
VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvjxUkebkUUUUU 
X-Originating-IP: [101.81.225.242] 
Date: Wed, 26 Apr 2017 14:11:42 +0800 (CST) 
X-CM-SenderInfo: pix130tbbsiiqu6rljoofrz/1tbivh7F0FZcM5OV1wAAsd 

--===============4516509904929376112== 
Content-Type: application/octet-stream 
MIME-Version: 1.0 
Content-Transfer-Encoding: base64 
Content-Type: application/pdf 
Content-Disposition: attachment; filename="data.txt" 

77u/ 

--===============4516509904929376112==--

來源

2017-04-26 Bella

如果你看一下documentation for the MIMEApplication class，你應該通過構造函數中的MIME類型，而不是將其作爲一個單獨的頭。

part = MIMEApplication(open("file.pdf", 'rb').read(), 'pdf') 
filename="file.pdf" 
part.add_header('Content-Disposition', 'attachment', filename=filename)

來源

2017-04-26 07:03:59 gview

如果我使用part ['Content-Type'] ='application/pdf'，header dict中的Content-Type（application/octet-stream）不會被改變嗎？ – Bella

application/octet-stream是沒有已知MIME類型時的默認值。在這種情況下，您知道您正在附加pdf，因此您應該使用pdf MIME類型。請參閱：https://tools.ietf.org/rfc/rfc3778 – gview

我嘗試它（part = MIMEApplication（open（「D：\ data.txt」，'rb'）。read（），'application/pdf'））！而附件內容類型更改爲應用程序/應用程序！ – Bella

smtp發送電子郵件和爲什麼一個附件可以有兩個Content-Type？

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