By seeing this answer I learned that Google blocks certain apps to connect, due to "lack of application of modern security standards" in those apps, and I can make Google allow my account to connect from such apps - I must do that explicitly.
This was due to an issue in Django mailing:
send_mail(
u"Message",
render_to_string('template.txt', {'data': data}),
settings.EMAIL_HOST_USER,
[dest['address'] for dest in settings.FORM_DESTINATIONS],
html_message=render_to_string('template.html', {'data': data}),
)
And my EMAIL_ settings involving a @gmail.com account (neither SSL/465 or TLS/587 worked).
Does this mean Django 1.7 has an insecure mailing mechanism? What does "secure" mean in this context and what mailing standards is Django not applying?
Edit Even when I provided context for this question (a pointed answer and related links/docs) perhaps some readers may not find where does Google talks about "secure"/"insecure" applications. By entering here using your google account credentials there's an option telling about "less secure apps" which lead to this page, which has a "More Info" link, pointing Here (this link does not need authentication).