[Checkins] [zopefoundation/zope.sendmail] 7075de: Exceptions are not subscriptable under Python 3

[Marius Gedminas]

  Branch: refs/heads/appveyor
  Home:   https://github.com/zopefoundation/zope.sendmail
  Commit: 7075dea67c3db47f728a3cc8dc3f4122cd758f3e
      https://github.com/zopefoundation/zope.sendmail/commit/7075dea67c3db47f728a3cc8dc3f4122cd758f3e
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2020-08-20 (Thu, 20 Aug 2020)

  Changed paths:
    M src/zope/sendmail/queue.py

  Log Message:
  -----------
  Exceptions are not subscriptable under Python 3

I wish I knew what the exception class was that we're trying to catch
here.  Something from win32file, which is part of pywin32?