#24218: Add SMTPUTF8 support to send_message.
Reviewed by Maciej Szulik.
diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index 6895bed..71ccd2a 100755
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -872,7 +872,13 @@
to_addr, any Bcc field (or Resent-Bcc field, when the Message is a
resent) of the Message object won't be transmitted. The Message
object is then serialized using email.generator.BytesGenerator and
- sendmail is called to transmit the message.
+ sendmail is called to transmit the message. If the sender or any of
+ the recipient addresses contain non-ASCII and the server advertises the
+ SMTPUTF8 capability, the policy is cloned with utf8 set to True for the
+ serialization, and SMTPUTF8 and BODY=8BITMIME are asserted on the send.
+ If the server does not support SMTPUTF8, an SMPTNotSupported error is
+ raised. Otherwise the generator is called without modifying the
+ policy.
"""
# 'Resent-Date' is a mandatory field if the Message is resent (RFC 2822
@@ -885,6 +891,7 @@
# option allowing the user to enable the heuristics. (It should be
# possible to guess correctly almost all of the time.)
+ self.ehlo_or_helo_if_needed()
resent = msg.get_all('Resent-Date')
if resent is None:
header_prefix = ''
@@ -900,14 +907,30 @@
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]
+ msg[header_prefix + 'Cc'])
+ if f is not None]
to_addrs = [a[1] for a in email.utils.getaddresses(addr_fields)]
# Make a local copy so we can delete the bcc headers.
msg_copy = copy.copy(msg)
del msg_copy['Bcc']
del msg_copy['Resent-Bcc']
+ international = False
+ try:
+ ''.join([from_addr, *to_addrs]).encode('ascii')
+ except UnicodeEncodeError:
+ if not self.has_extn('smtputf8'):
+ raise SMTPNotSupportedError(
+ "One or more source or delivery addresses require"
+ " internationalized email support, but the server"
+ " does not advertise the required SMTPUTF8 capability")
+ international = True
with io.BytesIO() as bytesmsg:
- g = email.generator.BytesGenerator(bytesmsg)
+ if international:
+ g = email.generator.BytesGenerator(
+ bytesmsg, policy=msg.policy.clone(utf8=True))
+ mail_options += ['SMTPUTF8', 'BODY=8BITMIME']
+ else:
+ g = email.generator.BytesGenerator(bytesmsg)
g.flatten(msg_copy, linesep='\r\n')
flatmsg = bytesmsg.getvalue()
return self.sendmail(from_addr, to_addrs, flatmsg, mail_options,