This relates to the unresolvedissue9208 (Python 2).SMTPHandler fails when receiving unicode strings.Example (frommsg109621):import logging,logging.handlerssmtpHandler = logging.handlers.SMTPHandler(    mailhost=("smtp.free.fr",25),    fromaddr="from@free.fr", toaddrs="to@free.fr",    subject=u"error message")LOG = logging.getLogger()LOG.addHandler(smtpHandler)LOG.error(u"accentu\u00E9")… fails:--- Logging error ---Traceback (most recent call last):  File "/usr/lib/python3.5/logging/handlers.py", line 985, in emit    smtp.sendmail(self.fromaddr, self.toaddrs, msg)  File "/usr/lib/python3.5/smtplib.py", line 846, in sendmail    msg = _fix_eols(msg).encode('ascii')UnicodeEncodeError: 'ascii' codec can't encode character '\xe9' in position 108: ordinal not in range(128)Call stack:  File "/tmp/x.py", line 8, in <module>    LOG.error(u"accentu\u00E9")Message: 'accentué'Arguments: ()As discussed inmsg252928 andmsg252931, EmailMessage/send_message should be used instead to resolve this issue.Patch attached.

This mostly looks good to me, Vinay.Simon: did you intentionally omit the date header, and if so why?  (The smtp server normally adds one, but you can't really depend on that).  Adding it would look like:  msg['Date'] = email.utils.localtime()(Hmm.  I wonder if send_message should add Date header if there isn't one...)

I omitted the date header w/o intent. Basically because I couldn't quickly figure out how to set it.

New changeseteb843115e052 by Vinay Sajip in branch '3.4':Closes#25411: Improved Unicode support in SMTPHandler.https://hg.python.org/cpython/rev/eb843115e052New changesetb99b3ddd0ac4 by Vinay Sajip in branch '3.5':Closes#25411: Merged fix from 3.4.https://hg.python.org/cpython/rev/b99b3ddd0ac4New changeset522b5cdffd42 by Vinay Sajip in branch 'default':Closes#25411: Merged fix from 3.5.https://hg.python.org/cpython/rev/522b5cdffd42