email validation problems

I'm using the Email validator, and experiencing some trouble with domain
resolution.  After having some intermittent failures, I
made a simple fuzz tester and found an address which doesn't work.
So as not to generate any extra spam traffic for these guys, replace '??' with
'taker' below :

>>> v = validators.Email(resolve_domain=True)
>>> email='foo@??.com'
>>> v.to_python(email)
Invalid: The domain of the email address does not exist (the portion
after the @: ??.com)

However, I can dig their MX records just fine.  I think it's a
pyDNS issue, but I'm not sure.

I'm running Debian testing using:
FormEncode-0.7.1-py2.4
python-dns 2.3.0-5.1

Any suggestions?  Thanks!

 --joseph

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