### Python QQ邮箱 IMAP 下载指定发件人邮件 要使用Python连接QQ邮箱并通过IMAP协议下载来自特定发件人的邮件，可以按照以下方法实现： #### 连接QQ邮箱 首先需要导入必要的库并设置QQ邮箱的IMAP服务器地址以及登录凭证。QQ邮箱的IMAP服务器地址为`imap.qq.com`。 ```python import imaplib import email from email.header import decode_header import os def connect_qq_imap(username, password): # 创建IMAP4_SSL对象并连接到QQ邮箱的IMAP服务器 mail = imaplib.IMAP4_SSL('imap.qq.com') # 登录邮箱账户 mail.login(username, password) return mail ``` 此部分代码用于建立与QQ邮箱的连接[^1]。 #### 搜索指定发件人的邮件 通过IMAP协议中的`search`函数可以根据条件筛选邮件。对于指定发件人的邮件，可以通过`FROM`关键字进行搜索。 ```python def search_emails_by_sender(mail_connection, sender_email): # 选择收件箱 mail_connection.select("inbox") # 使用 FROM 关键字搜索指定发件人的邮件 status, messages = mail_connection.search(None, f'FROM "{sender_email}"') if status != 'OK': raise Exception(f"Failed to retrieve emails from {sender_email}") return messages[0].split() ``` 这部分代码实现了针对特定发件人邮件的检索功能[^2]。 #### 解析邮件内容 每封邮件的内容可能包含多个部分（如正文、附件等）。为了提取有用的信息或者保存附件，需逐层解析邮件结构。 ```python def parse_email_content(mail_connection, email_id, download_dir): # 获取指定ID的邮件内容 res, msg_data = mail_connection.fetch(email_id, "(RFC822)") raw_email = msg_data[0][1] # 将原始邮件字符串转换成email.message.Message对象 email_message = email.message_from_bytes(raw_email) subject, encoding = decode_header(email_message["Subject"])[0] if isinstance(subject, bytes): subject = subject.decode(encoding or "utf-8") print(f"Processing Email with Subject: {subject}") for part in email_message.walk(): content_type = part.get_content_type() content_disposition = str(part.get("Content-Disposition")) if "attachment" in content_disposition: filename = part.get_filename() if filename: decoded_filename, charset = decode_header(filename)[0] if isinstance(decoded_filename, bytes): decoded_filename = decoded_filename.decode(charset or "utf-8") file_path = os.path.join(download_dir, decoded_filename) with open(file_path, "wb") as f: f.write(part.get_payload(decode=True)) print(f"Attachment saved at: {file_path}") ``` 这段代码负责解析邮件的具体内容，并处理其中的附件[^3]。 #### 主程序逻辑 最后将以上各模块组合起来形成完整的流程控制。 ```python if __name__ == "__main__": username = "your_qq_account@qq.com" password = "your_auth_code_or_password" try: mail_conn = connect_qq_imap(username, password) target_sender = "specific.sender@example.com" matching_emails = search_emails_by_sender(mail_conn, target_sender) output_directory = "./downloaded_attachments/" if not os.path.exists(output_directory): os.makedirs(output_directory) for email_num in matching_emails: parse_email_content(mail_conn, email_num, output_directory) except Exception as e: print(e) finally: mail_conn.logout() ``` 整个过程涵盖了从连接邮箱至最终断开链接的所有必要步骤[^4]。