django doesn't send me error mails

I can send mails using send_mail or mail_admins methods

but django it self doesn't send me any mail on 404 error or 500 error.

I have even added  raise Exception('Test') to my view function
I see the 500 error for that but no mail was sent

This is my settings.py: http://dpaste.com/846959/

I use :
django from git master
python 3.2

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