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[3.13] gh-124864: Extends smtplib documentation on ESMTP options format (GH-132547) #142797

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hugovk merged 1 commit into from
Dec 16, 2025
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[3.13] gh-124864: Extends smtplib documentation on ESMTP options format (GH-132547) #142797

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6 changes: 4 additions & 2 deletions Doc/library/smtplib.rst
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Expand Up @@ -440,9 +440,11 @@ An :class:`SMTP` instance has the following methods:
Send mail. The required arguments are an :rfc:`822` from-address string, a list
of :rfc:`822` to-address strings (a bare string will be treated as a list with 1
address), and a message string. The caller may pass a list of ESMTP options
(such as ``8bitmime``) to be used in ``MAIL FROM`` commands as *mail_options*.
(such as ``"8bitmime"``) to be used in ``MAIL FROM`` commands as *mail_options*.
ESMTP options (such as ``DSN`` commands) that should be used with all ``RCPT``
commands can be passed as *rcpt_options*. (If you need to use different ESMTP
commands can be passed as *rcpt_options*. Each option should be passed as a string
containing the full text of the option, including any potential key
(for instance, ``"NOTIFY=SUCCESS,FAILURE"``). (If you need to use different ESMTP
options to different recipients you have to use the low-level methods such as
:meth:`!mail`, :meth:`!rcpt` and :meth:`!data` to send the message.)

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