regression? validate_email accepts trailing dash

Hi everybody,

I've found this behavior that feels like a bug. I would like your opinion on whether it is a bug.

In django 1.6 an EmailField will accept an address of the form 'foo@bar.com-'

In django 1.4 it would trigger a ValidationError.

Should this be considered a regression?

The way I interpret the email domain name specs foo@bar.com- is technically a valid email address, because bar.com- is technically a valid domain. But in practice there aren't any top level domains with a dash at the end, so this behavior is completely unexpected.

reference:

 * email spec: http://tools.ietf.org/html/rfc2822#section-3.4

 * domain name spec: http://tools.ietf.org/html/rfc1035#section-2.3.1

Tested in both versions like so:

   from django.core.validators import validate_email

   validate_email('foo@bar.com-')

Should I file a bug, do you think?

Thanks

-jason

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