Are you sure your context is thread-safe, ie. it's rebuilt from scratch 
every time you render an email and not re-used, stored in a global variable, 
class variable, whatever? Your problem description very much sounds like 
someone is fiddling with the context while the template is rendering.

  A popular way to generate such a problem would be to use a literal dict as 
default parameter, something like:

    def my_render_email(recipient, context={}):
        context['email'] = recipient
        body = render_to_string('template.html', context) 
        ...

  That is absolutely positively guaranteed to blow up in your face when you 
least expect it.

        mjl


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