import poplib

# 輸入郵件地址, 口令和POP3服務(wù)器地址:
email = raw_input('Email: ')
password = raw_input('Password: ')
pop3_server = raw_input('POP3 server: ')

# 連接到POP3服務(wù)器:
server = poplib.POP3(pop3_server)
# 可以打開或關(guān)閉調(diào)試信息:
# server.set_debuglevel(1)
# 可選:打印POP3服務(wù)器的歡迎文字:
print(server.getwelcome())
# 身份認(rèn)證:
server.user(email)
server.pass_(password)
# stat()返回郵件數(shù)量和占用空間:
print('Messages: %s. Size: %s' % server.stat())
# list()返回所有郵件的編號:
resp, mails, octets = server.list()
# 可以查看返回的列表類似['1 82923', '2 2184', ...]
print(mails)
# 獲取最新一封郵件, 注意索引號從1開始:
index = len(mails)
resp, lines, octets = server.retr(index)
# lines存儲了郵件的原始文本的每一行,
# 可以獲得整個郵件的原始文本:
msg_content = '\r\n'.join(lines)
# 稍后解析出郵件:
msg = Parser().parsestr(msg_content)
# 可以根據(jù)郵件索引號直接從服務(wù)器刪除郵件:
# server.dele(index)
# 關(guān)閉連接:
server.quit()

import email
from email.parser import Parser
from email.header import decode_header
from email.utils import parseaddr

msg = Parser().parsestr(msg_content)

# indent用于縮進顯示:
def print_info(msg, indent=0):
  if indent == 0:
    # 郵件的From, To, Subject存在于根對象上:
    for header in ['From', 'To', 'Subject']:
      value = msg.get(header, '')
      if value:
        if header=='Subject':
          # 需要解碼Subject字符串:
          value = decode_str(value)
        else:
          # 需要解碼Email地址:
          hdr, addr = parseaddr(value)
          name = decode_str(hdr)
          value = u'%s <%s>' % (name, addr)
      print('%s%s: %s' % (' ' * indent, header, value))
  if (msg.is_multipart()):
    # 如果郵件對象是一個MIMEMultipart,
    # get_payload()返回list，包含所有的子對象:
    parts = msg.get_payload()
    for n, part in enumerate(parts):
      print('%spart %s' % (' ' * indent, n))
      print('%s--------------------' % (' ' * indent))
      # 遞歸打印每一個子對象:
      print_info(part, indent + 1)
  else:
    # 郵件對象不是一個MIMEMultipart,
    # 就根據(jù)content_type判斷:
    content_type = msg.get_content_type()
    if content_type=='text/plain' or content_type=='text/html':
      # 純文本或HTML內(nèi)容:
      content = msg.get_payload(decode=True)
      # 要檢測文本編碼:
      charset = guess_charset(msg)
      if charset:
        content = content.decode(charset)
      print('%sText: %s' % (' ' * indent, content + '...'))
    else:
      # 不是文本,作為附件處理:
      print('%sAttachment: %s' % (' ' * indent, content_type))

def decode_str(s):
  value, charset = decode_header(s)[0]
  if charset:
    value = value.decode(charset)
  return value

def guess_charset(msg):
  # 先從msg對象獲取編碼:
  charset = msg.get_charset()
  if charset is None:
    # 如果獲取不到，再從Content-Type字段獲取:
    content_type = msg.get('Content-Type', '').lower()
    pos = content_type.find('charset=')
    if pos >= 0:
      charset = content_type[pos + 8:].strip()
  return charset

+OK Welcome to coremail Mail Pop3 Server (163coms[...])
Messages: 126. Size: 27228317

From: Test <xxxxxx@qq.com>
To: Python愛好者 <xxxxxx@163.com>
Subject: 用POP3收取郵件
part 0
--------------------
 part 0
 --------------------
  Text: Python可以使用POP3收取郵件……...
 part 1
 --------------------
  Text: Python可以<a href="...">使用POP3</a>收取郵件……...
part 1
--------------------
 Attachment: application/octet-stream