python - 如何使用 python IMAP 提取多部分电子邮件的正文并保存附件？

Question

我正在开发一个项目，我会收到带有特定“主题”的电子邮件。有网友转发给我的。正文由文本组成，但在原始电子邮件中，并且在转发的行上方没有输入新文本。电子邮件的任一部分还包含附件。

我使用 python 和 IMAP 编写了以下代码，并且仅当电子邮件是新的而不是转发的电子邮件时才能够存储附件和正文。

def getAllEmails(username, password, subject, fromEmail, folderName):
   
    mail = imaplib.IMAP4_SSL("imap.outlook.com")
    mail.login(username, password)
    print("Login success..........")
    
    mail.select("inbox")
      
    result, data = mail.search(None, 'SUBJECT', '"{}"'.format(subject))
    inbox_item_list_subject = data[0].split()
  
    result, data = mail.search(None, 'FROM', '"{}"'.format(fromEmail))
    inbox_item_list_sender = data[0].split() 
        
    inbox_item_list = list(set(inbox_item_list_subject) & set(inbox_item_list_sender))
    
    counter = 0
    for item in inbox_item_list:
        counter+=1
        
        result2, email_data = mail.fetch(item,'(RFC822)')
        raw_email = email_data[0][1].decode("utf-8")   
        email_message = email.message_from_string(raw_email)

        #getting information about the mail like to, from,subject, date.
        to_ = email_message['To']         
        from_ = email_message['From']
        subject_ = email_message['Subject']
        date_ = email_message['date']
        
        # setting the format to save in text file. 
        to_ = "to: "
        from_ = "from: " + from_ + str("\n")
        date_ = "date: " + date_ + str("\n")
        subject__ = "subject: " + subject_ + str("\n")

        # accessing the subparts of email_message
        for part in email_message.walk():
            if part.get_content_maintype == 'multipart':
                continue
            content_type = part.get_content_type()
            content_disposition = str(part.get("Content-Disposition"))
            
            filename = part.get_filename()

            ext = mimetypes.guess_extension(part.get_content_type())
            # allowing pdf, jpg, png and doc format only
            if ext == '.pdf' or ext == '.csv' or ext == '.png' or ext == '.docx' or ext == '.xlsx':
                if filename:
                    save_path = os.path.join(os.getcwd(), folderName, subject_)
                    
                    if not os.path.exists(save_path):
                        os.makedirs(save_path)
                    
                    with open(os.path.join(save_path, filename), 'wb') as fp:
                        fp.write(part.get_payload(decode=True))
                        fp.close()

        # getting the body part of the mail.
            try:
                body = part.get_payload(decode=True).decode()   
            except:
                pass
        
        
        # saving the required information in a file named as "textfile.txt".
            if content_type == "text/plain" and "attachment" not in content_disposition:
                save_path = os.path.join(os.getcwd(), folderName, subject_)

                if not os.path.exists(save_path):
                    os.makedirs(save_path)

                filename = "textfile.txt"
                with open(os.path.join(save_path, filename), 'w+', encoding='utf-8') as fp:
                    fp.writelines(to_)
                    fp.writelines(from_)
                    fp.writelines(date_)
                    fp.writelines(subject__)
                    fp.writelines(body)
                    fp.close()
    mail.close()
    mail.logout()

我希望存储正文和附件，即使它是转发电子邮件？

Answer 1

看来您已经有了提取附件的部分。 尝试使用此代码来检索多部分电子邮件的正文。

您可能需要弄清楚如何将您的部分与此部分合并。

def getAll(username, password, folderName):

     mail = imaplib.IMAP4_SSL("imap.outlook.com")    
     mail.login(username, password)
     print("Login success..........")
    
     mail.select("INBOX")
    
     result, data = mail.search(None, '(FROM "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ccb9bfa9be8caba1ada5a0e2afa3a1" rel="noreferrer noopener nofollow">[email protected]</a>" SUBJECT "Subject-Name")')

     for num in data[0].split():
         h, d = mail.fetch(num, '(RFC822)')
         raw_email = d[0][1].decode("utf-8")

         message = email.message_from_string(raw_email)
         email_from = str(make_header(decode_header(message['From'])))
         subject = str(make_header(decode_header(message['Subject'])))

         print("SUBJECT: "+ subject)
         print("FROM: "+ email_from)
        
         msg_encoding = 'iso-2022-jp'

         if message.is_multipart() == False:
             single  = bytearray(message.get_payload(), msg_encoding)
             body = single.decode(encoding = msg_encoding)
        else:  
             multi = message.get_payload()[0]
             body = multi.get_payload(decode=True).decode(encoding = msg_encoding)
             body = re.sub('<[^<]+?>', '', body) # Remove special characters

         print("Printing the body:" + body)