#23924: EmailMessage type checks should raise TypeError, not AssertionError
-----------------------------+--------------------
     Reporter:  martinblech  |      Owner:  nobody
         Type:  Bug          |     Status:  new
    Component:  Core (Mail)  |    Version:  master
     Severity:  Normal       |   Keywords:
 Triage Stage:  Unreviewed   |  Has patch:  0
Easy pickings:  1            |      UI/UX:  0
-----------------------------+--------------------
 If I run the following code:

 {{{#!python
 email = EmailMessage(
     'Subject', 'Content',
     '[email protected]',
     '[email protected]')

 print(email.message())
 }}}

 With the `-O` option, I get:

 {{{
 Traceback (most recent call last):
   File "x.py", line 6, in <module>
     '[email protected]')
   File "/home/berker/hacking/django/django/core/mail/message.py", line
 227, in __init__
     assert not isinstance(to, six.string_types), '"to" argument must be a
 list or tuple'
 AssertionError: "to" argument must be a list or tuple
 }}}

 But without it, it fails silently and produces a broken `To` header:

 {{{
 From nobody Wed Nov 26 18:30:08 2014
 MIME-Version: 1.0
 Content-Type: text/plain; charset="utf-8"
 Content-Transfer-Encoding: 7bit
 Subject: Subject
 From: [email protected]
 To: t, o, @, e, x, a, m, p, l, e, ., c, o, m
 Date: Wed, 26 Nov 2014 18:30:08 -0000
 Message-ID: <20141126183008.1632.71698@rama>

 Content
 }}}

--
Ticket URL: <https://code.djangoproject.com/ticket/23924>
Django <https://code.djangoproject.com/>
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