晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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:mod:`smtpd` --- SMTP Server
============================

.. module:: smtpd
   :synopsis: A SMTP server implementation in Python.

.. moduleauthor:: Barry Warsaw <barry@zope.com>
.. sectionauthor:: Moshe Zadka <moshez@moshez.org>

**Source code:** :source:`Lib/smtpd.py`

--------------

This module offers several classes to implement SMTP servers.  One is a generic
do-nothing implementation, which can be overridden, while the other two offer
specific mail-sending strategies.


SMTPServer Objects
------------------


.. class:: SMTPServer(localaddr, remoteaddr)

   Create a new :class:`SMTPServer` object, which binds to local address
   *localaddr*.  It will treat *remoteaddr* as an upstream SMTP relayer.  Both
   *localaddr* and *remoteaddr* should be a :ref:`(host, port) <host_port>`
   tuple.  The object inherits from :class:`asyncore.dispatcher`, and so will
   insert itself into :mod:`asyncore`'s event loop on instantiation.


   .. method:: process_message(peer, mailfrom, rcpttos, data)

      Raise :exc:`NotImplementedError` exception. Override this in subclasses to
      do something useful with this message. Whatever was passed in the
      constructor as *remoteaddr* will be available as the :attr:`_remoteaddr`
      attribute. *peer* is the remote host's address, *mailfrom* is the envelope
      originator, *rcpttos* are the envelope recipients and *data* is a string
      containing the contents of the e-mail (which should be in :rfc:`2822`
      format).


DebuggingServer Objects
-----------------------


.. class:: DebuggingServer(localaddr, remoteaddr)

   Create a new debugging server.  Arguments are as per :class:`SMTPServer`.
   Messages will be discarded, and printed on stdout.


PureProxy Objects
-----------------


.. class:: PureProxy(localaddr, remoteaddr)

   Create a new pure proxy server. Arguments are as per :class:`SMTPServer`.
   Everything will be relayed to *remoteaddr*.  Note that running this has a good
   chance to make you into an open relay, so please be careful.


MailmanProxy Objects
--------------------


.. class:: MailmanProxy(localaddr, remoteaddr)

   Create a new pure proxy server. Arguments are as per :class:`SMTPServer`.
   Everything will be relayed to *remoteaddr*, unless local mailman configurations
   knows about an address, in which case it will be handled via mailman.  Note that
   running this has a good chance to make you into an open relay, so please be
   careful.

haha - 2025