邮件已下载好，不需要联网

如果你已经下载好了邮件并且不需要联网来查看它们，你可以将邮件存储在本地文件夹中，然后编写一个程序来读取这些文件。这里有一个简单的Python脚本，它假设邮件是以特定格式（例如，Mbox或.eml格式）存储在目录下的：

import os
import email
from email.header import decode_header

def read_local_email(directory):
    # 获取目录下所有的邮件文件
    email_files = [f for f in os.listdir(directory) if f.endswith('.eml') or f.endswith('.mbox')]

    messages = []
    for file_name in email_files:
        with open(os.path.join(directory, file_name), 'rb') as f:
            message = email.message_from_file(f)
            messages.append(process_email(message))
    
    return messages

def process_email(message):
    # 解析邮件信息
    subject, encoding = decode_header(message['Subject'])[0]
    if isinstance(subject, bytes):
        subject = subject.decode(encoding)

    sender = email.utils.parseaddr(message['From'])[1]
    body = ''
    if message.is_multipart():
        for part in message.walk():
            if part.get_content_type() == 'text/plain':
                body += part.get_payload().decode('utf-8')
    else:
        body = message.get_payload().decode('utf-8')

    return {
        'subject': subject,
        'sender': sender,
        'body': body
    }

# 使用函数读取本地邮件
local_directory = '/path/to/your/local/email/folder'
emails = read_local_email(local_directory)

for email in emails:
    print(f"Subject: {email['subject']}, Sender: {email['sender']} - Body: {email['body']}")

在这个例子中，你需要替换`'/path/to/your/local/email/folder'`为你的实际邮件存储路径。这个脚本会遍历文件夹中的每个邮件文件，将其解析成结构化的字典，包含邮件的主题、发件人和正文。