>>> from poplib import POP3
>>> conn = POP3('pop.163.com')
>>> conn.user('collinsctk@163.com')
b'+OK core mail'
>>> conn.pass_('xxxxx')
b'+OK 1 message(s) [2409 byte(s)]'
>>> conn.stat()
(1, 2409)
>>> conn.list()
(b'+OK 1 2409', [b'1 2409'], 8)
>>> conn.top(1,0)
------省略邮件头--------
>>> conn.retr(1)
------省略邮件内容--------
>>> conn.quit()
b'+OK core mail'