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gh-137339: Clarify host and port parameter behavior in smtplib.SMTP_SSL initialization #137340

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gh-137339: Clarify host and port parameter behavior in smtplib.SMTP_SSL initialization #137340

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Clarify host and port parameter behavior in smtplib.SMTP_SSL initiali…
Aniketsy Aug 3, 2025
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Clarify host and port parameter behavior in smtplib.SMTP_SSL initiali…
Aniketsy Aug 3, 2025
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12 changes: 8 additions & 4 deletions Doc/library/smtplib.rst
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Expand Up @@ -23,10 +23,11 @@

.. class:: SMTP(host='', port=0, local_hostname=None[, timeout], source_address=None)

An :class:`SMTP` instance encapsulates an SMTP connection. It has methods

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py:attr reference target not found: default_port [ref.attr]
that support a full repertoire of SMTP and ESMTP operations. If the optional
*host* and *port* parameters are given, the SMTP :meth:`connect` method is
called with those parameters during initialization. If specified,
that support a full repertoire of SMTP and ESMTP operations.
If *host* is omitted or set to an empty string, no connection is made during initialization; you must
call :meth:`connect` manually before using the instance.
If *port* is zero,the value of the :attr:`default_port` attribute is used. If specified,
*local_hostname* is used as the FQDN of the local host in the HELO/EHLO
command. Otherwise, the local hostname is found using
:func:`socket.getfqdn`. If the :meth:`connect` call returns anything other
Expand Down Expand Up @@ -78,10 +79,13 @@
.. class:: SMTP_SSL(host='', port=0, local_hostname=None, * [, timeout], \
context=None, source_address=None)

An :class:`SMTP_SSL` instance behaves exactly the same as instances of

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py:meth reference target not found: connect [ref.meth]

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py:meth reference target not found: connect [ref.meth]

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py:meth reference target not found: starttls [ref.meth]
:class:`SMTP`. :class:`SMTP_SSL` should be used for situations where SSL is
required from the beginning of the connection and using :meth:`starttls` is
not appropriate. If *host* is not specified, the local host is used. If
not appropriate. If the optional *host* and *port* parameters are given, the
SMTP_SSL :meth:`connect` method is called with those parameters during initialization.
If *host* is omitted or an empty string, no connection is made during initialization;
you must call :meth:`connect` manually before using the instance. If
*port* is zero, the standard SMTP-over-SSL port (465) is used. The optional
arguments *local_hostname*, *timeout* and *source_address* have the same
meaning as they do in the :class:`SMTP` class. *context*, also optional,
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