New submission from Michaël Lemaire <[email protected]>:
Hi,
I noticed that SMTP.send_message, when getting the sender and recipients from
the Message object, strips the name from recipients (to keep only the address),
but not from the sender.
if from_addr is None:
# Prefer the sender field per RFC 2822:3.6.2.
from_addr = (msg[header_prefix + 'Sender']
if (header_prefix + 'Sender') in msg
else msg[header_prefix + 'From'])
if to_addrs is None:
addr_fields = [f for f in (msg[header_prefix + 'To'],
msg[header_prefix + 'Bcc'],
msg[header_prefix + 'Cc'])
if f is not None]
to_addrs = [a[1] for a in email.utils.getaddresses(addr_fields)]
There is an ugly side-effect to that (starting with Python 3.5) : if the sender
name contains a non-ascii character, send_message will then require the
SMTPUTF8 option from the SMTP server, and raise a SMTPNotSupportedError if
unavailable. This is not wanted because the sender name is not actually sent to
the SMTP server in the "MAIL FROM:" command (it is only sent in the MIME
payload), so the SMTPUTF8 option should not be required based on it (it should
only depend on the addresses).
----------
components: Library (Lib)
messages: 311275
nosy: Michaël Lemaire
priority: normal
severity: normal
status: open
title: smtplib's SMTP.send_message behaves differently with from_addr and
to_addrs
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8
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<https://bugs.python.org/issue32727>
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