Django won't send 500 or 404 emails, but django.core.mail.EmailMessage and django.utils.log.AdminEmailHandler work

For some reason, I can't get my server to send 500 or 404 emails. I
am set up to send email through gmail, and it is working properly when
I send error emails through a logger set up using
django.utils.log.AdminEmailHandler, and also when I send mail using
django.core.mail.EmailMessage.

I have DEBUG = False and SEND_BROKEN_LINK_EMAILS = True.

The server is a linode running Ubuntu 10.04, Django 1.3 and Python
2.6.5.

Any idea where I could look to track down the problem?

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