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__future__.rst.txt
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calendar.rst.txt
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frameworks.rst.txt
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functional.rst.txt
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functions.rst.txt
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functools.rst.txt
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glob.rst.txt
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Code Editor : smtpd.rst.txt
:mod:`smtpd` --- SMTP Server ============================ .. module:: smtpd :synopsis: A SMTP server implementation in Python. :deprecated: .. moduleauthor:: Barry Warsaw <barry@python.org> .. sectionauthor:: Moshe Zadka <moshez@moshez.org> **Source code:** :source:`Lib/smtpd.py` -------------- This module offers several classes to implement SMTP (email) servers. .. deprecated:: 3.6 :mod:`smtpd` will be removed in Python 3.12 (see :pep:`PEP 594 <594#smtpd>` for details). The `aiosmtpd <https://aiosmtpd.readthedocs.io/>`_ package is a recommended replacement for this module. It is based on :mod:`asyncio` and provides a more straightforward API. Several server implementations are present; one is a generic do-nothing implementation, which can be overridden, while the other two offer specific mail-sending strategies. Additionally the SMTPChannel may be extended to implement very specific interaction behaviour with SMTP clients. The code supports :RFC:`5321`, plus the :rfc:`1870` SIZE and :rfc:`6531` SMTPUTF8 extensions. SMTPServer Objects ------------------ .. class:: SMTPServer(localaddr, remoteaddr, data_size_limit=33554432,\ map=None, enable_SMTPUTF8=False, decode_data=False) 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. *data_size_limit* specifies the maximum number of bytes that will be accepted in a ``DATA`` command. A value of ``None`` or ``0`` means no limit. *map* is the socket map to use for connections (an initially empty dictionary is a suitable value). If not specified the :mod:`asyncore` global socket map is used. *enable_SMTPUTF8* determines whether the ``SMTPUTF8`` extension (as defined in :RFC:`6531`) should be enabled. The default is ``False``. When ``True``, ``SMTPUTF8`` is accepted as a parameter to the ``MAIL`` command and when present is passed to :meth:`process_message` in the ``kwargs['mail_options']`` list. *decode_data* and *enable_SMTPUTF8* cannot be set to ``True`` at the same time. *decode_data* specifies whether the data portion of the SMTP transaction should be decoded using UTF-8. When *decode_data* is ``False`` (the default), the server advertises the ``8BITMIME`` extension (:rfc:`6152`), accepts the ``BODY=8BITMIME`` parameter to the ``MAIL`` command, and when present passes it to :meth:`process_message` in the ``kwargs['mail_options']`` list. *decode_data* and *enable_SMTPUTF8* cannot be set to ``True`` at the same time. .. method:: process_message(peer, mailfrom, rcpttos, data, **kwargs) Raise a :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:`5321` format). If the *decode_data* constructor keyword is set to ``True``, the *data* argument will be a unicode string. If it is set to ``False``, it will be a bytes object. *kwargs* is a dictionary containing additional information. It is empty if ``decode_data=True`` was given as an init argument, otherwise it contains the following keys: *mail_options*: a list of all received parameters to the ``MAIL`` command (the elements are uppercase strings; example: ``['BODY=8BITMIME', 'SMTPUTF8']``). *rcpt_options*: same as *mail_options* but for the ``RCPT`` command. Currently no ``RCPT TO`` options are supported, so for now this will always be an empty list. Implementations of ``process_message`` should use the ``**kwargs`` signature to accept arbitrary keyword arguments, since future feature enhancements may add keys to the kwargs dictionary. Return ``None`` to request a normal ``250 Ok`` response; otherwise return the desired response string in :RFC:`5321` format. .. attribute:: channel_class Override this in subclasses to use a custom :class:`SMTPChannel` for managing SMTP clients. .. versionadded:: 3.4 The *map* constructor argument. .. versionchanged:: 3.5 *localaddr* and *remoteaddr* may now contain IPv6 addresses. .. versionadded:: 3.5 The *decode_data* and *enable_SMTPUTF8* constructor parameters, and the *kwargs* parameter to :meth:`process_message` when *decode_data* is ``False``. .. versionchanged:: 3.6 *decode_data* is now ``False`` by default. 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) .. deprecated-removed:: 3.9 3.11 :class:`MailmanProxy` is deprecated, it depends on a ``Mailman`` module which no longer exists and therefore is already broken. 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. SMTPChannel Objects ------------------- .. class:: SMTPChannel(server, conn, addr, data_size_limit=33554432,\ map=None, enable_SMTPUTF8=False, decode_data=False) Create a new :class:`SMTPChannel` object which manages the communication between the server and a single SMTP client. *conn* and *addr* are as per the instance variables described below. *data_size_limit* specifies the maximum number of bytes that will be accepted in a ``DATA`` command. A value of ``None`` or ``0`` means no limit. *enable_SMTPUTF8* determines whether the ``SMTPUTF8`` extension (as defined in :RFC:`6531`) should be enabled. The default is ``False``. *decode_data* and *enable_SMTPUTF8* cannot be set to ``True`` at the same time. A dictionary can be specified in *map* to avoid using a global socket map. *decode_data* specifies whether the data portion of the SMTP transaction should be decoded using UTF-8. The default is ``False``. *decode_data* and *enable_SMTPUTF8* cannot be set to ``True`` at the same time. To use a custom SMTPChannel implementation you need to override the :attr:`SMTPServer.channel_class` of your :class:`SMTPServer`. .. versionchanged:: 3.5 The *decode_data* and *enable_SMTPUTF8* parameters were added. .. versionchanged:: 3.6 *decode_data* is now ``False`` by default. The :class:`SMTPChannel` has the following instance variables: .. attribute:: smtp_server Holds the :class:`SMTPServer` that spawned this channel. .. attribute:: conn Holds the socket object connecting to the client. .. attribute:: addr Holds the address of the client, the second value returned by :func:`socket.accept <socket.socket.accept>` .. attribute:: received_lines Holds a list of the line strings (decoded using UTF-8) received from the client. The lines have their ``"\r\n"`` line ending translated to ``"\n"``. .. attribute:: smtp_state Holds the current state of the channel. This will be either :attr:`COMMAND` initially and then :attr:`DATA` after the client sends a "DATA" line. .. attribute:: seen_greeting Holds a string containing the greeting sent by the client in its "HELO". .. attribute:: mailfrom Holds a string containing the address identified in the "MAIL FROM:" line from the client. .. attribute:: rcpttos Holds a list of strings containing the addresses identified in the "RCPT TO:" lines from the client. .. attribute:: received_data Holds a string containing all of the data sent by the client during the DATA state, up to but not including the terminating ``"\r\n.\r\n"``. .. attribute:: fqdn Holds the fully qualified domain name of the server as returned by :func:`socket.getfqdn`. .. attribute:: peer Holds the name of the client peer as returned by ``conn.getpeername()`` where ``conn`` is :attr:`conn`. The :class:`SMTPChannel` operates by invoking methods named ``smtp_<command>`` upon reception of a command line from the client. Built into the base :class:`SMTPChannel` class are methods for handling the following commands (and responding to them appropriately): ======== =================================================================== Command Action taken ======== =================================================================== HELO Accepts the greeting from the client and stores it in :attr:`seen_greeting`. Sets server to base command mode. EHLO Accepts the greeting from the client and stores it in :attr:`seen_greeting`. Sets server to extended command mode. NOOP Takes no action. QUIT Closes the connection cleanly. MAIL Accepts the "MAIL FROM:" syntax and stores the supplied address as :attr:`mailfrom`. In extended command mode, accepts the :rfc:`1870` SIZE attribute and responds appropriately based on the value of *data_size_limit*. RCPT Accepts the "RCPT TO:" syntax and stores the supplied addresses in the :attr:`rcpttos` list. RSET Resets the :attr:`mailfrom`, :attr:`rcpttos`, and :attr:`received_data`, but not the greeting. DATA Sets the internal state to :attr:`DATA` and stores remaining lines from the client in :attr:`received_data` until the terminator ``"\r\n.\r\n"`` is received. HELP Returns minimal information on command syntax VRFY Returns code 252 (the server doesn't know if the address is valid) EXPN Reports that the command is not implemented. ======== ===================================================================
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