#22027: Add RFC6531 support to smtplib.

Initial patch by Milan Oberkirch.

2 files changed, 37 insertions, 1 deletions

diff --git a/Doc/library/smtplib.rst b/Doc/library/smtplib.rst
index 44473fe..133fa56 100644
--- a/Doc/library/smtplib.rst
+++ b/Doc/library/smtplib.rst
@@ -61,6 +61,10 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
    .. versionchanged:: 3.3
       source_address argument was added.
 
+   .. versionadded:: 3.5
+      The SMTPUTF8 extension (:rfc:`6531`) is now supported.
+
+
 .. class:: SMTP_SSL(host='', port=0, local_hostname=None, keyfile=None, \
                     certfile=None [, timeout], context=None, \
                     source_address=None)
@@ -161,6 +165,13 @@ A nice selection of exceptions is defined as well:
    The server refused our ``HELO`` message.
 
 
+.. exception:: SMTPNotSupportedError
+
+    The command or option attempted is not supported by the server.
+
+    .. versionadded:: 3.5
+
+
 .. exception:: SMTPAuthenticationError
 
    SMTP authentication went wrong.  Most probably the server didn't accept the
@@ -291,6 +302,9 @@ An :class:`SMTP` instance has the following methods:
    :exc:`SMTPAuthenticationError`
       The server didn't accept the username/password combination.
 
+   :exc:`SMTPNotSupportedError`
+      The ``AUTH`` command is not supported by the server.
+
    :exc:`SMTPException`
       No suitable authentication method was found.
 
@@ -298,6 +312,9 @@ An :class:`SMTP` instance has the following methods:
    turn if they are advertised as supported by the server (see :meth:`auth`
    for a list of supported authentication methods).
 
+   .. versionchanged:: 3.5
+      :exc:`SMTPNotSupportedError` may be raised.
+
 
 .. method:: SMTP.auth(mechanism, authobject)
 
@@ -349,7 +366,7 @@ An :class:`SMTP` instance has the following methods:
    :exc:`SMTPHeloError`
       The server didn't reply properly to the ``HELO`` greeting.
 
-   :exc:`SMTPException`
+   :exc:`SMTPNotSupportedError`
      The server does not support the STARTTLS extension.
 
    :exc:`RuntimeError`
@@ -363,6 +380,11 @@ An :class:`SMTP` instance has the following methods:
       :attr:`SSLContext.check_hostname` and *Server Name Indicator* (see
       :data:`~ssl.HAS_SNI`).
 
+   .. versionchanged:: 3.5
+      The error raised for lack of STARTTLS support is now the
+      :exc:`SMTPNotSupportedError` subclass instead of the base
+      :exc:`SMTPException`.
+
 
 .. method:: SMTP.sendmail(from_addr, to_addrs, msg, mail_options=[], rcpt_options=[])
 
@@ -399,6 +421,9 @@ An :class:`SMTP` instance has the following methods:
    recipient that was refused.  Each entry contains a tuple of the SMTP error code
    and the accompanying error message sent by the server.
 
+   If ``SMTPUTF8`` is included in *mail_options*, and the server supports it,
+   *from_addr* and *to_addr* may contain non-ASCII characters.
+
    This method may raise the following exceptions:
 
    :exc:`SMTPRecipientsRefused`
@@ -417,12 +442,20 @@ An :class:`SMTP` instance has the following methods:
       The server replied with an unexpected error code (other than a refusal of a
       recipient).
 
+   :exc:`SMTPNotSupportedError`
+      ``SMTPUTF8`` was given in the *mail_options* but is not supported by the
+      server.
+
    Unless otherwise noted, the connection will be open even after an exception is
    raised.
 
    .. versionchanged:: 3.2
       *msg* may be a byte string.
 
+   .. versionchanged:: 3.5
+      ``SMTPUTF8`` support added, and :exc:`SMTPNotSupportedError` may be
+      raised if ``SMTPUTF8`` is specified but the server does not support it.
+
 
 .. method:: SMTP.send_message(msg, from_addr=None, to_addrs=None, \
                               mail_options=[], rcpt_options=[])
diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst
index 92e1142..86173a0 100644
--- a/Doc/whatsnew/3.5.rst
+++ b/Doc/whatsnew/3.5.rst
@@ -527,6 +527,9 @@ smtplib
   :class:`smtplib.SMTP`.  (Contributed by Gavin Chappell and Maciej Szulik in
   :issue:`16914`.)
 
+* :mod:`smtplib` now support :rfc:`6531` (SMTPUTF8).  (Contributed by
+  Milan Oberkirch and R. David Murray in :issue:`22027`.)
+
 sndhdr
 ------